Productivity of Hereford, highgrade Simmental and Belmont Red beef herds in central Queensland. 3. Explanatory models for pregnancy rate

1992 ◽  
Vol 32 (5) ◽  
pp. 563 ◽  
Author(s):  
PK O'Rourke ◽  
CR Esdale ◽  
CJ Howitt ◽  
TH Rudder
Keyword(s):  
Pregnancy Rate ◽  
Explanatory Models ◽  
Pregnancy Rates ◽  
Low Fertility ◽  
High Fertility ◽  
Lactating Cows ◽  
Highly Sensitive ◽  
Breeding Herd ◽  
Beef Herds ◽  
Plateau Level

Statistical models for pregnancy rate of Hereford, highgrade Simmental and Belmont Red cows were developed for brigalow pastures in central Queensland. Cows grazing improved pasture at 1 breeder/2 ha over 6 years, from 1979 to 1985, were mated to single sires for 78 days from early December each year and their calves weaned in May. Overall herd pregnancy rates were 74% Hereford, 69% highgrade Simmental and 86% Belmont Red. The 2-year-old maidens and non-lactating cows had higher rates than lactating cows for Hereford and highgrade Simmental. Mature, lactating and non-lactating cows had higher liveweights at the start of mating than first lactation cows and all were heavier than maidens. Pregnancy rate for maidens was not affected by liveweight, but 71% Hereford, 90% highgrade Simmental and 95% Belmont Red were above 300 kg at the start of mating. Response in pregnancy rate to liveweight at start of mating plateaued above 375 kg for first lactation Belmont Red and mature lactating Hereford; above 400 kg for mature lactating Belmont Red; and above 425 kg for mature lactating highgrade Simmental; but this liveweight was not important for first lactation Hereford and highgrade Simmental, nor for non-lactating cows. Mature cows calving in the first 6 weeks of the season had 13-30% higher pregnancy rates than those calving later. Previous lactation status did not affect pregnancy rate for highgrade Simmental and Belmont Red, but Hereford cows rearing a calf in the previous year had 14% higher pregnancy rates than those failing to rear a calf. Breed differences were apparent in the responses to the factors modelled. Pregnancy rates of lactating Belmont Red cows were sensitive to time of calving and liveweight at start of mating, even though these rates exceeded 80%. Mature, lactating highgrade Simmental were highly sensitive and Hereford intermediate, but first lactation and non-lactating Hereford and highgrade Simmental did not respond to these factors, even though pregnancy rates were low. Segregation of the breeding herd into high, intermediate and low expected fertility groups can be based on calving time and liveweight at start of mating. The high fertility group, consisting of cows calving in the first 6 weeks of the season and weighing greater than the plateau level, had advantages compared with the herd averages of 16 and 8% in fertility for first and mature lactating Belmont Red, respectively. Conversely, the low fertility group, consisting of late calving cows of low liveweight, had disadvantages of 30 and 18% for first and mature lactating Belmont Red. respectively.

EVALUATION OF BULL AND COW FERTILITY AT PASTURE IN SINGLE-SIRE MATING

1985 ◽  
Vol 65 (4) ◽  
pp. 799-809 ◽  
Author(s):  
M. MAKARECHIAN ◽  
A. FARID ◽  
R. T. BERG
Keyword(s):  
Body Weight ◽  
Pregnancy Rate ◽  
Average Daily Gain ◽  
Beef Cows ◽  
Pregnancy Rates ◽  
Low Fertility ◽  
Scrotal Circumference ◽  
Semen Volume ◽  
Calving Season ◽  
Daily Gain

Pregnancy rates and calving dates of beef cows in 27 single-sire breeding herds mated to yearling or 2-yr old bulls were used in this study. The breed groups of bulls were Hereford and Beef Synthetic and cow herds were Hereford, Hereford cross and Beef Synthetic, respectively. A week before the start of the breeding season the bulls were scored for libido, their scrotal circumferences were measured and semen samples were collected. Semen volume, sperm motility and percent normal cells were evaluated. The average bull to cow ratio was 1:20. Pregnancy rate increased as age and body weight of cows increased, but it was independent of the previous calving date. Calving date was not related to body weight or age of cow, but it was influenced by the previous calving date. Each day delay in calving after the first 5 wk of calving season resulted in a 0.7-day delay in the date of calving during the next calving season. The Beef Synthetic-sired herds had higher pregnancy rates (P < 0.05) than the Hereford-sired herds, but the average calving dates of the two groups were similar. Cows mated to 2-yr-old bulls had 5% higher (P = 0.12) pregnancy rate than those mated to yearling bulls. Five of the herds showed low fertility and late calving, probably due to low fertility of the bulls. Yearling weight and feedlot average daily gain were positively (P < 0.05) related to bull fertility. The number of services performed by a bull during a 10 min libido test and total libido score were also found to be useful in assessing bull fertility, but scrotal circumference or semen traits were not related to fertility of bulls when used in single-sire mating at pasture. Key words: Beef cattle, bull fertility, single-sire mating

Effect of cattle tick (Boophilus microplus) infestation on performance of Bos indicus cross cows and their progeny

1988 ◽  
Vol 28 (1) ◽  
pp. 1 ◽  
Author(s):  
RG Holroyd ◽  
PJ Dunster ◽  
PK O'Rourke
Keyword(s):  
Pregnancy Rate ◽  
Bos Indicus ◽  
Treated Group ◽  
Pregnancy Rates ◽  
Boophilus Microplus ◽  
Cattle Tick ◽  
First Year ◽  
The Third ◽  
Lactating Cows ◽  
Tick Counts

The effects of cattle tick infestations on liveweight and fertility of Droughtmaster (1/2 Bos indicus) cows and on calf weaning weights were determined over 3 years. Tick populations on the control (non-dipped) group of cattle fluctuated, with mean annual tick counts/side being 9.5, 8.9 and 13.6 for years 1, 2 and 3 respectively, while the treated group of cattle, which were dipped every 21 days, were free of ticks. Tick counts were not related to fertility or liveweight change in pregnant-lactating cows or to calf growtb or weaning weights. Treatment for ticks significantly (P<0.05) affected liveweight change in pregnant-lactating cows on only a few occasions, and annual liveweight changes were not significantly influenced by treatment. When lactating cow pregnancy rates were low (< 30% for control cows), treatment for ticks increased the pregnancy rate by about 100% in 2 of the 3 years, these differences being significant only in the last year. Calves in the treated group were born significantly earlier in the first year and had significantly lighter birth weights in the third year. Treated calves grew faster to weaning and had higher weaning weights (mean difference 17.9 kg) than control calves but differences were significant in the first and third years only.

11 Invivo-derived embryo pregnancy rates at Maddox Dairy from 2008 to 2018

2020 ◽  
Vol 32 (2) ◽  
pp. 130
Author(s):  
D. Demetrio ◽  
A. Magalhaes ◽  
M. Oliveira ◽  
R. Santos ◽  
R. Chebel
Keyword(s):  
Pregnancy Rate ◽  
Embryo Transfer ◽  
Milk Production ◽  
Pregnancy Rates ◽  
The Other ◽  
Lactating Cows ◽  
June July August ◽  
June July ◽  
Management Changes ◽  
July August September

Maddox Dairy, located in Riverdale, CA, USA, is a Holstein herd that milks 3500 cows with a 305-day mature-equivalent milk production of 12 800 kg, and they have been producing high genetic animals by embryo transfer (ET) since the early 1980s. Invivo-derived embryos from Holstein donors were transferred fresh (grade 1 or 2) or frozen (grade 1), at morula (4), early blastocyst (5), or blastocyst (6) stage, to virgin heifers (VH, natural oestrus, 13-15 months old) or lactating cows (LC, Presynch-Ovsynch, 86 days in milk, first or second lactation) 6 to 9 days after oestrus. Pregnancy diagnosis was done by transrectal ultrasonography at 32-46 days in VH and by the IDEXX PAG test at 30 days in LC. June, July, August, September, and October were called critical months (first service AI conception rate drops below 44%) and compared with the other months. The data from 32 503 ETs between January 2008 and December 2018 are summarised on Table 1. Pregnancy rates (PR) are lower for LC recipients than for VH. Embryo transfers performed 7 or 8 days after oestrus had higher PR in both types of recipients and embryos, but Day 6 and 9 oestrus are also used with fair results. The season does not seem to affect PR. There is not enough difference in the combination of stage and days from oestrus for invivo-derived embryos. These numbers do not belong to a planned experiment. Several management changes during the years were made, which make it very difficult to apply statistical methods to analyse the data correctly. They are used as a tool to make decisions in an attempt to improve future results. Table 1.Pregnancy rate (PR) of virgin heifers (top) and lactating cows (bottom)-fresh (SH) and frozen (OZ) invivo-derived embryo transfer1 Heat-months SH-ST4 SH-ST5 SH-ST6 SH-All OZ-ST4 OZ-ST5 OZ-ST6 OZ-All PR% n PR% n PR% n PR% n PR% n PR% n PR% n PR% n Heifers 6 d-CM 62 934 66 243 68 69 63 1246 56 473 58 219 62 42 57 734 6 d-OM 62 1623 67 489 69 211 64 2323 56 600 55 296 48 137 55 1033 6 d-T 62 2557 67 732 69 280 63 3569 56 1073 57 515 51 179 56 1767 7 d-CM 64 1506 68 495 67 221 65 2222 60 822 62 340 63 156 61 1318 7 d-OM 66 2723 68 1021 69 510 67 4254 57 1120 59 581 57 231 58 1932 7 d-T 66 4229 68 1516 69 731 67 6476 58 1942 60 921 60 387 59 3250 8 d-CM 65 1348 64 518 67 322 65 2188 59 595 64 258 63 108 61 961 8 d-OM 66 2166 68 886 70 510 67 3562 61 770 60 364 51 130 60 1264 8 d-T 66 3514 67 1404 69 832 66 5750 60 1365 62 622 56 238 60 2225 9 d-CM 60 109 56 43 70 20 60 172 60 5 33 6 50 4 47 15 9 d-OM 58 129 63 57 60 40 60 226 63 16 50 18 75 4 58 38 9 d-T 59 238 60 100 63 60 60 398 62 21 46 24 63 8 55 53 All-CM 64 3897 66 1299 67 632 65 5828 58 1895 61 823 63 310 60 3028 All-OM 65 6641 67 2453 69 1271 66 10 365 58 2506 58 1259 53 502 58 4267 All-T 65 10 538 67 3752 69 1903 66 16 193 58 4401 60 2082 57 812 59 7295 Lactating cows 6 d-CM 54 265 48 86 50 12 53 363 38 141 31 77 50 10 36 228 6 d-OM 49 463 52 203 45 56 50 723 46 101 48 54 59 27 48 182 6 d-T 51 728 51 289 46 68 51 1086 41 242 38 131 57 37 42 410 7 d-CM 54 755 59 274 56 103 55 1137 43 928 48 450 43 192 45 1570 7 d-OM 55 914 66 367 54 109 58 1393 46 1052 45 564 47 353 46 1969 7 d-T 55 1669 63 641 55 212 57 2530 45 1980 46 1014 46 545 45 3539 8 d-CM 63 252 68 82 76 33 65 368 48 219 56 80 42 33 50 332 8 d-OM 61 257 64 161 53 47 61 466 50 191 53 77 56 16 51 284 8 d-T 62 509 65 243 63 80 63 834 49 410 55 157 47 49 50 616 All-CM 56 1272 58 442 60 148 57 1868 44 1288 47 607 43 235 45 2130 All-OM 55 1634 62 731 51 212 56 2582 47 1344 46 695 48 396 47 2435 All-T 55 2906 60 1173 55 360 57 4450 45 2632 47 1302 46 631 46 4565 1ST=stage; CM=critical months (June, July, August, September, and October); OM=other months.

Environmental and genotype effects on fertility in a commercial beef herd in central Queensland

1985 ◽  
Vol 25 (3) ◽  
pp. 489 ◽  
Author(s):  
TH Rudder ◽  
GW Seifert ◽  
HM Burrow
Keyword(s):  
Annual Variation ◽  
Age Groups ◽  
Lower Proportion ◽  
Older Age ◽  
Low Fertility ◽  
High Fertility ◽  
Age Group ◽  
Lactating Cows ◽  
Beef Herd ◽  
Genotype Effects

Joining liveweight, proportion pregnant and calving date were recorded from relatively low fertility (RLF) and relatively high fertility (RHF) tropically adapted genotypes. RLF genotypes were F2 et seq. Brahman x British crossbreds and Brahman back crosses while RHF genotypes were F1 Brahman x British and Africander infused crossbreds. Year effects had the largest and most consistent influence on joining liveweight, proportion of cows pregnant and calving date. RLF genotypes had a lower proportion pregnant than RHF genotypes in yearling heifers, 2-5-year-old and >9- year-old lactating cows, but there was no difference in the 6-8-year age group. Calving dates tended to be later in the RLF genotypes in the 2-5-year age groups, but were the same as RHF genotypes in older age groups. Annual variation in joining liveweight was explained by May-October rainfall, which was an indication of pasture productivity levels. The proportion of cows pregnant was related to joining liveweight; to achieve a high proportion in the RHF genotypes, target joining liveweights of about 275 and 375 kg were indicated for yearling heifers and lactating cows, respectively. There was no difference between RLF and RHF in the 6-8-year lactating age group, but in other age groups RLF genotypes tended to require an extra 25-75 kg joining liveweight to approximate the proportion pregnant in RHF genotypes over the lower and mid-liveweight ranges. However, at highest joining liveweights, RLF had a lower proportion pregnant than did RHF genotypes. Calving date influenced the proportion that became pregnant during the subsequent joining season, young cows being more sensitive to calving date than old cows, and RLF more sensitive than RHF genotypes.

28 COMPARISON OF NEW v. PREVIOUSLY USED INTRAVAGINAL DEVICE FOR A PROGESTERONE-BASED TIMED ARTIFICIAL INSEMINATION PROTOCOL IN NELORE (BOS INDICUS) COWS

2010 ◽  
Vol 22 (1) ◽  
pp. 171 ◽  
Author(s):  
J. H. Martins ◽  
M. I. S. Silva ◽  
G. A. Crepaldi ◽  
W. O. Melo ◽  
J. R. S. Torres-Júnior
Keyword(s):  
Pregnancy Rate ◽  
Fixed Time ◽  
Estradiol Benzoate ◽  
Sao Paulo ◽  
Pregnancy Rates ◽  
São Paulo ◽  
Device Removal ◽  
Serum Progesterone ◽  
New Device ◽  
Lactating Cows

The objective of this study was to evaluate the effect of reutilization of intravaginal progesterone devices on pregnancy rate of lactating and nonlactating Nelore cows submitted to fixed-time AI (FTAI). The study used 684 lactating cows (50 to 70 days postpartum) and 361 nonlactating cows (210 to 240 days postpartum). At random stages of the estrous cycle (Day 0), all animals received 2 mg of estradiol benzoate (Estrogin®, Farmavet, São Paulo, Brazil) and the animals of each category (lactating or nonlactating) were allocated in 1 of 2 treatments (new or used). Thus, the 4 groups consisted of lactating/new, lactating/used, nonlactating/new and nonlactating/used. The animals of lactating/new and nonlactating/new groups received a new intravaginal progesterone device (1 g of P4, DIB®, Intervet/Schering-Plough, São Paulo, Brazil) and the cows of lactating/used and nonlactating/used groups received a similar device that had previously been used for 8 days. At the time of P4 device removal (Day 8), the cows were treated with 150 μg of cloprostenol (Preloban®, Intervet/Schering-Plough), 1 mg of estradiol cypionate (ECP®, Pfizer, São Paulo, Brazil), and 300 IU of eCG (Folligon®, Intervet/Schering-Plough). The cows were FTAI on Day 10 (48 to 52 h after device removal). To evaluate the pregnancy rate, an ultrasonographic examination (CHISON 500VET, USP Brasil Eletromedicina, São Paulo, Brazil) was performed 30 days after the FTAI. Data were analyzed using the GENMOD procedure of SAS (SAS Institute, Cary, NC, USA).There was no interaction between treatment and BCS, AI bull, or technician. The pregnancy rates for the groups were 155/300 (51.7%a for lactating/new, 200/384 (52.1%a for lactating/used, 52/154 (33.8%b for nonlactating/new, and 96/207 (46.2%a for nonlactating/used (P = 0.0007). A reduction in pregnancy rate for nonlactating cows occurred when the intravaginal progesterone device was new. Although serum progesterone was not measured in the current trial, it is very likely that this finding might be explained by the high cyclicity rates in beef cows after weaning (210 days postpartum) and by the presence of CL producing additional support of progesterone besides the high P4 from the new device (Baruselli et al. 2004 Anim. Reprod. Sci. 82, 479-486). Many researchers found that greater circulating progesterone concentrations during progesterone implant treatment reduced LH pulsatility, LH follicular receptors, and follicular growth (Ireland and Roche, 1982 J. Reprod. Fertil. 64, 295-302). Furthermore, it seems likely that the presence of smaller-sized ovulatory follicles might contribute to ovulation failures, delayed ovulation, smaller CL area, and decrease in the pregnancy rate (Carvalho et al. 2008 Theriogenology 69, 167-175). In conclusion, lactating cows can be fixed-time inseminated using a new or a previously used DIB® as progesterone source. However, for nonlactating cows, a previously used device may increase pregnancy rates. USP Brasil Eletromedicina, ABS Pecplan and Fazendas Reunidas Rio Bravo.

Sources of variation in the fertility of a herd of zebu, British, and zebu × British cattle in Northern Australia

1973 ◽  
Vol 81 (2) ◽  
pp. 253-262 ◽  
Author(s):  
R. M. Seebeck
Keyword(s):  
Variance Components ◽  
Opposite Effect ◽  
The Other ◽  
Low Fertility ◽  
High Fertility ◽  
Lactating Cows ◽  
Sources Of Variation ◽  
The Mean ◽  
The Difference ◽  
Made In

SummaryResults of matings made in the Belmont breeding programme from 1954 to 1968 have been analysed. The analysis has been made within three groups. (1) The foundation cows in the years 1954–9; (2) the F1 generation which were mated within line in the years 1957–62; (3) the F2 and F3 generations which were mated within Africander cross (AX), Brahman cross (BX) and Shorthorn-Hereford (SH) lines in the years 1960–8. Fertility was based on the number of calves born, whether alive or dead, to the number of cows mated.In the foundation cows, Hereford cows had a fertility 9% higher than the Shorthorns. The difference between the bull breeds was not significant although the mean for the Brahman bulls was 16% below the mean of the other three breeds. There was a large variation in the fertility of the Brahman bulls. The fertility of the Shorthorn cows was depressed (by 8%) in the lactating cows as compared with dry cows, while there was an opposite effect in the Herefords. These latter effects showed year to year variation.In the F1 generation the differences between the breeds were not significant although both the AX (76·4%) and the BX (81·2%) were more fertile than the SH (70·1%). Estimates of heterosis in the F1 generation were 42% for the AX, 43% for the BX and 12% for the SH. Lactating cows were 7% more fertile than non-lactating cows. There were significant differences between the BX bulls used but not between bulls of the other two breeds. The effect of sires within breed on fertility of daughters was significant only within the SH, and the heritabilities of fortuity were estimated from the variance components for sires within breed to be 9%, 14% and 22% for AX, BX and SH respectively.In the F2 and F3 data the breeds were significantly different in fertility with averages of 77%, 61% and 67% for AX, BX and SH respectively. Thus by comparison with the fertilities of the F1 cows no loss of heterosis for fertility occurred in the AX, a very marked loss in the BX and only a slight loss in the SH. A significant interaction between age of cow and lactational status showed that in the mature cows, wet cows had a higher fertility than dry, while the converse applied in the 3-year-old cows. The interaction of lactational status with breed consisted of the wet zebu cross cattle having a relatively low fertility while the wet British cattle had a relatively high fertility. There were significant differences between bulls within each of the three breeds. The effect of sires was significant in the BX and SH. Heritabilities estimated from between sires within breeds variance components were – 12%, 22% and 25% for the AX, BX and SH respectively.

Effects of presynchronization and postinsemination treatments on pregnancy rates to a timed breeding Ovsynch protocol in dairy cows and heifers

2010 ◽  
Vol 90 (1) ◽  
pp. 35-44 ◽  
Author(s):  
M B Gordon ◽  
N Dinn ◽  
R Rajamahendran
Keyword(s):  
Dairy Cows ◽  
Pregnancy Rate ◽  
Dairy Cow ◽  
Artificial Insemination ◽  
Gonadotropin Releasing Hormone ◽  
Pregnancy Rates ◽  
Lactating Cows ◽  
Lactating Dairy Cows ◽  
Timed Artificial Insemination ◽  
To Receive

This study examined two strategies to improve pregnancy rate (PR) following Ovsynch timed artificial insemination (TAI) for lactating dairy cows (n = 225) and nulliparous heifers (n = 87). Animals were assigned randomly to receive one of three treatments: Ovsynch protocol (GnRH 7 d before and 48 h after one PGF2α treatment), Presynch + Ovsynch (two treatments of PGF2α 14 d apart followed by Ovsynch 14 d later), or Ovsynch + Post-AI GnRH (GnRH 6 d after Ovsynch TAI) for first service breeding. Pregnancy rates among treatments were not different in lactating cows (42.5, 48.0, and 44.9%) or heifers (65.5, 58.6, and 58.6%) for Ovsynch, Presynch + Ovsynch, and Ovsynch + Post-AI, respectively. Cows treated with Ovsynch had lower PR when bred < 76 d in milk (DIM) compared with Presynch + Ovsynch or Ovsynch + Post-AI treatments. In addition, cows and heifers that received Post-AI GnRH had greater progesterone (P4) concentrations on day 21 and day 28 post-TAI than the Ovsynch group. Animals with higher P4 concentrations at initiation of Ovsynch had better PR than those with low P4 concentrations. Presynch animals had a greater proportion of animals with P4 values above 1 ng mL-1 at the initiation of Ovsynch than those animals in the Ovsynch group (74.5 vs. 59.4%). Heifers had lower PR if they were <14.6 mo of age (48.9 vs. 75%) or weighed <380 kg (47.4 vs. 70.8%). Although no significance differences in PR were observed between treatments in cows or heifers, DIM in cows and age and weight in heifers affected PR.Key words: Ovsynch, presynchronization, gonadotropin-releasing hormone, dairy heifer, dairy cow, timed artificial insemination

Response in female fertility and calf growth to selection for pregnancy rate in tropical beef cattle

1993 ◽  
Vol 44 (7) ◽  
pp. 1509 ◽  
Author(s):  
GP Davis ◽  
NJ Corbet ◽  
MJ Mackinnon ◽  
DJS Hetzel ◽  
KW Entwistle ◽  
...  
Keyword(s):  
Pregnancy Rate ◽  
First Generation ◽  
Bos Indicus ◽  
Pregnancy Rates ◽  
Breeding Value ◽  
Calf Growth ◽  
Lactating Cows ◽  
High Line ◽  
Calf Survival ◽  
Selection Of

Direct response to divergent selection based on estimated breeding value for female pregnancy rate in a herd of Bos indicus cross cattle was evaluated along with correlated responses in calf survival, weaning rate, cow liveweight and calf growth. Pregnancy rates were significantly higher ( P < 0.05) in heifers of the High line compared with the Low line (High-Low=15� 5%) and in lactating 4-year-old cows (25�9.5%) and in 3 of the 5 years of the study (average difference 24%). The Low line had significantly ( P < 0.05) higher pregnancy rates in 1 year (-16�5.4%). These differences in pregnancy rates were reflected in weaning rates, but calf survival was only different between the lines in 2 of the 4 years analysed (-6� 3.0% in 1990 and 18�6.5% in 1991). The High line had a significantly ( P < 0.05) shorter days to calving than the Low line in heifers (High=309�2.2 days v. Low= 315�2.5 days), lactating 3-year-old cows (3l5� 3.6 days v. 331�4.1 days), non-lactating 3-year-old cows (301�5.4 days v. 320�4.6 days) and lactating 4-year-old cows (311�3.9 days v. 336�4.9 days). Differences between the lines in pre-weaning growth varied according to generation with significantly lower (P < 0.05) weaning weights (182�3.1 kg v. 189�3.3 kg) and pre-weaning growth (790�17 g/day v. 826� 17 g/day) in first generation High line calves from foundation dams and no difference between the lines in second generation calves from first generation dams. Post-weaning growth was significantly higher ( P < 0.05) in High line calves (350� 5 g/day v. 327�5 g/day). The results indicate that selection of sires on EBV for pregnancy rate leads to improved fertility in heifers and 4-year-old lactating cows without adverse effects on progeny growth.

Hormonal stimulation and some risk factors studied to improve bovine pregnancy rate at the Coastal areas of Barisal district of Bangladesh

2018 ◽  
Vol 52 (1-4) ◽  
pp. 22-30
Author(s):  
A K Paul ◽  
S M T Rahman
Keyword(s):  
Pregnancy Rate ◽  
Coastal Region ◽  
Hormonal Treatment ◽  
Coastal Areas ◽  
Pregnancy Rates ◽  
Hormonal Stimulation ◽  
Crossbred Cows ◽  
Treatment Groups ◽  
History Of ◽  
Group A

Hormonal treatment of cows at the coastal region of Barisal district of Bangladesh was performed to assess the improvement of pregnancy rate. A total of 100 cows and heifers with irregular history of cyclicity were selected randomly and divided into five treatment groups. The groups were A (treated with anthelmintic), B (treated with anthelmintic, vitamin ADE and multivitamin powder), C (treated with PGF2α), D (treated with GnRH) and E (treated with GnRH and PGF2α). Each group comprised of 20 animals. The age, breed and parity of experimental cows were considered during treatment. In the study, the cows treated with both GnRH and PGF2α (group E) showed significantly (p<0.05) higher estrus (80%) and pregnancy rate (60%) than that of group A, B, C and D. The overall estrus rates of local and crossbred cows were 64% and 70%, respectively and the pregnancy rates were 40 and 52%, respectively. The crossbred cows responded significantly (p<0.05) to hormonal treatment than that of local cows. Parity-2 cows showed higher estrus sign than that of other parities. However, the pregnancy rates were higher significantly (p<0.05) in parity-2 and parity ≥4 cows than that of parity-0, parity-1 and parity-3 cows. The pregnancy rate was also found higher in case of 4 to <5 years old cows than that of 2 to <3, 3 to <4, 5 to <6, and ≥6 years old. It may conclude that the hormonal regimen increases the pregnancy rate as well as decreases the undesired waiting of estrus and conception. Further study with more sample size will reveal the more effective treatment for cows at the coastal areas of Bangladesh.

Hormonal stimulation and some risk factors studied to improve bovine pregnancy rate at the Coastal areas of Barisal district of Bangladesh

2018 ◽  
Vol 52 (1-4) ◽  
pp. 22-30
Author(s):  
A K Paul ◽  
S M T Rahman
Keyword(s):  
Pregnancy Rate ◽  
Coastal Region ◽  
Hormonal Treatment ◽  
Coastal Areas ◽  
Pregnancy Rates ◽  
Hormonal Stimulation ◽  
Crossbred Cows ◽  
Treatment Groups ◽  
History Of ◽  
Group A

Hormonal treatment of cows at the coastal region of Barisal district of Bangladesh was performed to assess the improvement of pregnancy rate. A total of 100 cows and heifers with irregular history of cyclicity were selected randomly and divided into five treatment groups. The groups were A (treated with anthelmintic), B (treated with anthelmintic, vitamin ADE and multivitamin powder), C (treated with PGF2α), D (treated with GnRH) and E (treated with GnRH and PGF2α). Each group comprised of 20 animals. The age, breed and parity of experimental cows were considered during treatment. In the study, the cows treated with both GnRH and PGF2α (group E) showed significantly (p<0.05) higher estrus (80%) and pregnancy rate (60%) than that of group A, B, C and D. The overall estrus rates of local and crossbred cows were 64% and 70%, respectively and the pregnancy rates were 40 and 52%, respectively. The crossbred cows responded significantly (p<0.05) to hormonal treatment than that of local cows. Parity-2 cows showed higher estrus sign than that of other parities. However, the pregnancy rates were higher significantly (p<0.05) in parity-2 and parity ≥4 cows than that of parity-0, parity-1 and parity-3 cows. The pregnancy rate was also found higher in case of 4 to <5 years old cows than that of 2 to <3, 3 to <4, 5 to <6, and ≥6 years old. It may conclude that the hormonal regimen increases the pregnancy rate as well as decreases the undesired waiting of estrus and conception. Further study with more sample size will reveal the more effective treatment for cows at the coastal areas of Bangladesh.

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