COMPARISON AMONG SIRE GROUPS IN CONCEPTION RATE, GESTATION LENGTH AND CALVING EASE OF THEIR MATES

1982 ◽  
Vol 62 (3) ◽  
pp. 709-716 ◽  
Author(s):  
T. R. BATRA ◽  
A. J. McALLISTER ◽  
A. J. LEE ◽  
G. L. ROY ◽  
J. P. F. DARISSE ◽  
...  
Keyword(s):  
Birth Weight ◽  
Dairy Cattle ◽  
Fixed Effects ◽  
Conception Rate ◽  
Gestation Length ◽  
Retained Placenta ◽  
Sire Group ◽  
Calving Season ◽  
National Cooperative ◽  
Calving Difficulty

Data on conception rate, gestation length, incidence of calving difficulty and retained placenta were obtained from 269 heifers and 525 cows as mates of the pureline foundation phase sires of the National Cooperative Dairy Cattle Breeding Project. The data were analyzed by least squares separately for heifers and cows using a model containing fixed effects for station, year of calving, season of calving, sex of calf, line, sire groups within line, sires within sire group and line, birth weight of the calf as a covariate and residual. Effect of age at first calving was used as a covariate in the heifer data while the effect of parity was included in the cow data. The effect of station, year of calving, season of calving, line, sire groups within line and sires within sire group and line were significant (P < 0.05) for gestation length of heifers and cows. Other significant (P < 0.05) effects in heifers were age at calving on conception rate, sex and birth weight of the calf on calving difficulty. In addition the effects of sex and birth weight of the calf on gestation length, station and parity on calving difficulty and station and line on retained placenta were significant in cows. Key words: Reproductive performance, dairy cattle

COMPARISON OF THE HEIFER REPRODUCTION TRAITS OF THE DAUGHTERS OF SEVERAL SIRE GROUPS

1983 ◽  
Vol 63 (2) ◽  
pp. 269-278 ◽  
Author(s):  
T. R. BATRA ◽  
A. J. McALLISTER ◽  
A. J. LEE ◽  
J. P. CHESNAIS ◽  
J. P. F. DARISSE ◽  
...  
Keyword(s):  
Dairy Cattle ◽  
Fixed Effects ◽  
Birth Season ◽  
Cattle Breeding ◽  
Retained Placenta ◽  
Brown Swiss ◽  
Reproduction Traits ◽  
Dairy Cattle Breeding ◽  
Sire Group ◽  
National Cooperative

Ages at first heat and first conception, age and weight at first calving, number of services per conception, and incidence of difficult calving and retained placenta were obtained from 853 heifers of the National Cooperative Dairy Cattle Breeding project of the Research Branch of Agriculture Canada. Among these, 483 heifers were from Agriculture Canada Research Branch Holstein cows and by Research Branch, Canadian and U.S. Holstein sires (H line). The other heifers were from Research Branch Ayrshire cows and by Research Branch, Canadian, U.S. and Finnish Ayrshire as well as Brown Swiss and Norwegian Red sires (A line). The data were analyzed by least squares analysis of variance using a model containing fixed effects of station, year of birth, season of birth, line, sire groups within line, and sires within sire group within line. The effects of station and line were significant for most of the heifer reproduction traits studied while the effect of year of birth was only significant for age at first conception and weight at first calving. H line heifers on the average showed first heat 27 days earlier, were 11 days younger at first conception, were 13 days younger at first calving, were 33 kg heavier at first calving, had 30% more difficult calving and 9% fewer retained placenta than the A line heifers. Differences among the sire groups within the H line were small and nonsignificant while within the A line they were significant for age at first heat and weight at first calving. Key words: Heifer reproduction traits, dairy cattle

scholarly journals Evaluation of gestation length and birth weight of offspring of Polish native cattle breeds in context of estimating genetic parameters

2018 ◽  
Vol 63 (No. 8) ◽  
pp. 323-330
Author(s):  
Nienartowicz-Zdrojewska Anna ◽  
Sobek Zbigniew ◽  
Różańska-Zawieja Jolanta
Keyword(s):  
Body Weight ◽  
Birth Weight ◽  
Gestation Length ◽  
Black And White ◽  
Research Material ◽  
Native Cattle ◽  
Newborn Calves ◽  
Calving Season ◽  
Calving Difficulty ◽  
Birth Body Weight

Research material included data on gestation length of 15 436 cows of Polish native breeds. These were: White Backed (BG; 324 records), Polish Red (RP; 5396 records), Polish Black and White (ZB; 3508 records), and Polish Red and White (ZR; 6208 records). The calvings took place in 2005–2009, and we analysed two calving seasons, lactation number, the degree of calving difficulty, sex, and body weight of newborn calves. The effect of birth year on gestation length and birth weight of offspring was statistically significant, whereas calving season had statistically highly significant effect on both. Gestation length in the analysed breeds was 281.02, 283.35, 280.5, 281.53 for BG, RP, ZB, and ZR, respectively. The birth body weight heritability was 0.13 (RP), 0.33 (ZB) and 0.40 (ZR).

Correlation among Calf Birth Weight, Calving Difficulty and Gestation Length in a Korean Holstein Dairy Cattle Herd

2015 ◽  
Vol 26 (2) ◽  
pp. 85-89
Author(s):  
Yun Ho Choy ◽  
◽  
Jeong Il Won ◽  
Ho Baek Yoon ◽  
Kwang Hyun Cho ◽  
...  
Keyword(s):  
Birth Weight ◽  
Dairy Cattle ◽  
Cattle Herd ◽  
Gestation Length ◽  
Dairy Cattle Herd ◽  
Calving Difficulty

scholarly journals Evaluation of gestation length and birth weight of offspring of Polish native cattle breeds in context of estimating genetic parameters

2018 ◽  
Vol 63 (No. 8) ◽  
pp. 323-330
Author(s):  
Nienartowicz-Zdrojewska Anna ◽  
Sobek Zbigniew ◽  
Różańska-Zawieja Jolanta
Keyword(s):  
Body Weight ◽  
Birth Weight ◽  
Gestation Length ◽  
Black And White ◽  
Research Material ◽  
Native Cattle ◽  
Newborn Calves ◽  
Calving Season ◽  
Calving Difficulty ◽  
Birth Body Weight

Research material included data on gestation length of 15 436 cows of Polish native breeds. These were: White Backed (BG; 324 records), Polish Red (RP; 5396 records), Polish Black and White (ZB; 3508 records), and Polish Red and White (ZR; 6208 records). The calvings took place in 2005–2009, and we analysed two calving seasons, lactation number, the degree of calving difficulty, sex, and body weight of newborn calves. The effect of birth year on gestation length and birth weight of offspring was statistically significant, whereas calving season had statistically highly significant effect on both. Gestation length in the analysed breeds was 281.02, 283.35, 280.5, 281.53 for BG, RP, ZB, and ZR, respectively. The birth body weight heritability was 0.13 (RP), 0.33 (ZB) and 0.40 (ZR).

DIFFERENCES BETWEEN SIRE GROUPS IN BODY MEASUREMENTS AND BODY WEIGHT CHANGES OF LACTATING COWS

1983 ◽  
Vol 63 (1) ◽  
pp. 27-37
Author(s):  
C. Y. LIN ◽  
T. R. BATRA ◽  
A. J. McALLISTER ◽  
A. J. LEE ◽  
J. P. F. DARISSE ◽  
...  
Keyword(s):  
Body Weight ◽  
Dairy Cattle ◽  
Fixed Effects ◽  
Body Measurements ◽  
Weight Changes ◽  
Body Weight Changes ◽  
Brown Swiss ◽  
Lactating Cows ◽  
Sire Group ◽  
National Cooperative

Body weights and measurements of 694 first, 519 second and 329 third lactation cows in five Research Branch herds of the National Cooperative Dairy Cattle Breeding Project of Agriculture Canada were studied. The A line cows were daughters of U.S., Canadian and Finnish Ayrshire proven bulls, Brown Swiss and Norwegian Red proven bulls and young Research Branch Ayshire bulls and Research Branch Ayrshire cows. Highly selected U.S. and Canadian Holstein proven bulls and young Research Branch bulls mated to Research Branch Holstein cows produced the H-line cows. The model for analysis contained fixed effects for station, year of birth, line, sire group within line and sire within sire group within line as classification variables and age at calving as a covariable. Sire group, line, station and sire had significant effects on all weights studied. However, most effects were not significant for weight changes. Daughters of Brown Swiss and Norwegian Red sires were nearly as heavy as the daughters of Holstein bulls. On average, cows lost about 20 kg of weight from calving to 56 days postpartum of first lactation. The older first calvers were found to lose more weight from calving to 56 days of first lactation and gain less weight from 56 days postpartum onward than the younger first calvers. The effects of station, line and age at calving were significant for most body measurements. Sire group effects were significant for 13 out of 24 measurements. Significant differences between sire groups existed in stature (withers height) at all lactations and ages. In contrast, body length (shoulder to hook) did not differ significantly between sire groups from 112 days of first lactation onward. Key words: Body weight changes, body measurements, dairy cattle

scholarly journals 192 Effects of dam relative calving date on progeny performance

2019 ◽  
Vol 97 (Supplement_3) ◽  
pp. 27-28
Author(s):  
Vitor R G Mercadante ◽  
Robin R White ◽  
John Currin ◽  
Heather L Bradford ◽  
Sherrie Clarke ◽  
...  
Keyword(s):  
Birth Weight ◽  
Fixed Effects ◽  
Least Square ◽  
Mixed Effect ◽  
Full Dataset ◽  
Effect Model ◽  
Calving Season ◽  
Cattle Herds ◽  
Virginia Department ◽  
Significant Interaction Term

Abstract The objective of this study was to establish the relationships between when a cow was born within the calving season and the performance of her offspring. Data from the Virginia Department of Corrections beef cattle herds were collated for 7 locations over 7 years (2010 to 2017), with 2 calving seasons per year. Data from Spring of 2011 were missing. The full dataset contained 19,253 individual animal observations. Within each location, year, and calving season combination, the calving season was defined as starting when the first calf was born and terminating when the final calf was born. The relative calving date (RCD) within each calving season was defined by calculating the number of days between when the calving occurred and when the calving season started, divided by the length of the season in days. For heifer calves that were retained as replacement heifers (n = 2,800), the RCD and birth weight of their calves were used as response variables of a mixed-effect model with fixed effects of dam RCD, season (fall vs spring), and calf sex. All 2 and 3 way interactions were also included as fixed effects. Both calving year and sire were used as random effects. Fixed effects were iteratively removed from the model when non-significant; however, non-significant linear terms were retained if involved in a significant interaction term. The final calf RCD model included significant effects of dam RCD (P = 0.006), season (P &lt; 0.001), calf sex (P = 0.0737), and the interaction between dam RCD and calf sex (P = 0.055). The final calf birth weight model included only linear terms for calf sex (P &lt; 0.001) and dam RCD (P = 0.029). Least square means for these relationships are depicted in Table 1.

RELATIONSHIPS OF REPRODUCTION TRAITS, BODY WEIGHT AND MILK YIELD IN DAIRY CATTLE

1986 ◽  
Vol 66 (1) ◽  
pp. 53-65 ◽  
Author(s):  
T. R. BATRA ◽  
A. J. LEE ◽  
A. J. McALLISTER
Keyword(s):  
Body Weight ◽  
Dairy Cattle ◽  
Milk Yield ◽  
Fixed Effects ◽  
Genetic Correlations ◽  
Calving Interval ◽  
Phenotypic Correlations ◽  
Reproduction Traits ◽  
Heritability Estimates ◽  
National Cooperative

The relationships between reproduction traits, body weight and milk yield were investigated using data from 1611 heifers and 733 cows from two lines of the National Cooperative Dairy Cattle Breeding Project. The data were analyzed separately for heifers and cows within lines using a mixed linear model containing fixed effects for station, year of birth, season of birth and random effect of sires. Heritability estimates and genetic correlations were estimated by a paternal half-sib analysis. Heritability estimates for heifer and cow reproduction traits ranged between 0 and 26% while those of body weights at calving and 112 d postpartum and milk yield ranged from 24 to 43%. Heifers with difficult calving had a higher incidence of retained placenta than those with normal calving. Phenotypic correlations between heifer reproduction traits and milk yield during first lactation were small. High milk production in cows was associated with longer calving interval. Phenotypic correlations between heifer's and cow's reproduction traits were small. Difficult calving in heifers impairs reproductive performance after calving resulting in greater number of days from calving to first and last breeding and leading to a longer calving interval. Key words: Reproduction traits, heifers, cows, milk yield, dairy cattle

scholarly journals The effect of paragenetic factors on reproductive traits of simmental cows

2007 ◽  
Vol 23 (5-6-2) ◽  
pp. 1-8
Author(s):  
M.D. Petrovic ◽  
Z. Skalicki ◽  
V. Bogdanovic ◽  
M.M. Petrovic
Keyword(s):  
Birth Weight ◽  
Reproductive Traits ◽  
Gestation Length ◽  
Gender Interaction ◽  
Regression Effect ◽  
Service Period ◽  
Calving Season ◽  
Fertility Traits ◽  
Effect Of Age ◽  
Birth Type

The examination was made on the effect of systematic factors (parturition group, calving season, birth type, calf gender, and birth type-calf gender interaction) and age at first conception on the expression of reproductive traits (gestation length, service period, fertility intensity and calf birth weight) in 143 Simmental cows. The overall mean (?) for gestation length, service period, intercalving period and calf birth weight was 284.14 days, 153.82 days, 416.92 days and 35.40 kg, respectively. The parturition group effect on all fertility traits was highly significant (P<0.01). The calving season statistically significantly (P<0.05) affected the intercalving period and calf birth weight. Birth type induced very significantly longer gestation (P<0.01) and higher calf birth weight in singles (P<0.01) and significantly longer service period in twins (P<0.05). Calf gender had a very significant effect (P<0.01) only on calf birth weight, and the interaction between birth type and calf gender significantly affected gestation duration only (P<0.05). The regression effect of age at first conception on all fertility traits was not significant (P>0.05).

scholarly journals EVALUATION OF PRODUCTIVE AND REPRODUCTIVE PERFORMANCES OF BLACK BENGAL GOATS IN RAJSHAHI GOVERNMENT GOAT DEVELOPMENT FARM IN BANGLADESH

2019 ◽  
Vol 1 (2) ◽  
pp. 201-210
Author(s):  
M. I. Z. Moni ◽  
M. A. Samad
Keyword(s):  
Birth Weight ◽  
Litter Size ◽  
Post Partum ◽  
Economic Status ◽  
Reproductive Traits ◽  
Young Female ◽  
Conception Rate ◽  
Morbidity And Mortality ◽  
Gestation Length ◽  
Intensive System

Background: The Black Bengal goat (BBG) is well adapted food animals with profitable productive and reproductive traits being naturally reared to enhance economic status and food security in rural people. Bangladesh government has taken program through establishment of ‘Government Goat Development Farms’ (GGDF) to enhance the goat rearing activities of the smallholders at rural level but the research reports on the productive and reproductive performances of goats in these GGDF are very limited. Objective: The main objective of this study was to evaluate the productive and reproductive performances of the BBG reared in semi-intensive system at the Rajshahi GGDF Materials and Methods: The Rajshahi GGDF had 398 goat populations of which 121 does were selected to study the productive and reproductive performances during the period from July 2010 to June 2011. The age of first estrus, conception rate by natural service, gestation length, post-partum heat, kidding interval, litter size, survivability of kids, morbidity and mortality of kids and their seasonal influence were studied. Results: The age of young female BBG showed 1st estrus varied from 180 to 270 with an average of 204  27 days. The conception rate varied from 88 to 100 with an average of 97% with natural services. The gestation length varied from 145 to 182 with an average of 150  5 days. The post-partum heat period varied from 60 to 90 days with an average of 69  7 days. The kidding interval varied from 199 to 268 with an average of 219  13 days. The litter size varied from 1 to 3 with an average of 2. Out of 234 kids borne, 47.44% were male and 52.56% female with higher mortality in male (10.81%) than female (5.69%) with an overall average mortality of 8.12%. There was no significant influence of season and parity on the birth weight of kids. However, the heavier birth weight of kids was recorded in male (1.38 kg) than female (1.17kg) kids. The birth of twin kids (56.41%) was found significantly (p < 0.0001) highest in comparison to triplets (26.92%), single (11.54%) and quadruplet (5.13%). Conclusions: The results support promising breeding and reproductive efficiency of BBG under local environmental conditions and therefore, there is a need to be improved milk yield of dam and control of morbidity and mortality in BBG kids. It may be concluded that the productive and reproductive performances of the BBG reared by using semi-intensive system of management appears to be encouraging at the Rajshahi GGDF which could be extended and compared to research findings with other four GGDF in Bangladesh.

scholarly journals Additive genetic variance and covariance in some reproduetive disorders in Hungarian Holstein Friesian using multi-trait animal model

2000 ◽  
Vol 43 (6) ◽  
pp. 573-582
Author(s):  
A. A. Amin ◽  
T. Gere ◽  
W. H. Kishk
Keyword(s):  
Fixed Effects ◽  
Additive Genetic Variance ◽  
Selection Index ◽  
Ovarian Cysts ◽  
Separate Analysis ◽  
Retained Placenta ◽  
Milk Fever ◽  
Holstein Friesian ◽  
Heritability Estimates ◽  
Calving Difficulty

Abstract. Relationships between some reproduetive disorders in the first 3 lactations of Holstein Friesian cows were investigated for 1886 lactation records. Multiple-trait maximum likelihood procedure which included sire cow within sire as random effect and herd, parity, month and year of calving as fixed effects was used to estimate heritabilities and repeatabilities for the studied traits. Abortion within 60 days, retained placenta, ovarian cysts calving difficulty, dystocia, mastitis, and calving type were coded as 0 and 1 for heritability and repeatability estimations. Pooled and separate analysis were applied on the first 3 lactations. Abortion within 60 days retained placenta, ovarian cysts, calving difficulty, dystocia, mastitis, abortion no. and calving type had moderate heritability estimates which ranged from 0.15 to 0.24. Low heritability estimates and a weak sire variance component were obtained for milk fever. The most frequent disorder traits were mastitis, milk fever abortion no calving type and calving difficulty (0.37 to 0.72). Up word trend of heritability estimates with advancing order of lactation was observed for mastitis, abortion within 60 days, and abortion no. while heritability estimates for calving type, calving difficulty and dystocia had a back word trend. These results help in determining the suitable age of selection. Additive genetic variances and covariances among the studied traits have indicated reducing incidence rates if selection index procedure used in this filed. Strong negative genetic correlation between milk fever and abortion no. (−0.429) while negative phenotypic correlations between all studied traits were not more than −0.120 which was estimated for calving difficulty and abortion no.

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