Effect of Immunization of Gilts with Zona Pellucida Antigen on Conception Rate and Litter Size

2003 ◽  
Vol 21 (2) ◽  
Author(s):  
O. Fayemi
Keyword(s):  
Litter Size ◽  
Zona Pellucida ◽  
Conception Rate

THE ACCUMULATIVE EFFECT OF FINNSHEEP BREEDING IN CROSSBREEDING SCHEMES: REPRODUCTIVE PERFORMANCE

1988 ◽  
Vol 68 (1) ◽  
pp. 69-81 ◽  
Author(s):  
MOHAMED H. FAHMY ◽  
JACQUES J. DUFOUR
Keyword(s):  
Body Weight ◽  
Mortality Rate ◽  
Key Words ◽  
Litter Size ◽  
Reproductive Performance ◽  
Conception Rate ◽  
Ovulation Rate ◽  
Genetic Groups ◽  
Linear Regressions ◽  
Size At Birth

Reproductive performance and body weight were studied on 361 ewes, representing Finnsheep (F), DLS (a population of 1/2 Dorset, 1/4 Leicester, 1/4 Suffolk) and seven combinations ranging from 1/8 to 7/8 Finnsheep breeding. Conception rate in yearlings was 61.5% for DLS compared to 89.0% for F with the crosses being intermediate. Conception rate in older ewes was similar in the different genetic groups (avg. 94%). Ovulation rate and litter size at birth of DLS ewes were 1.72 and 1.44 lambs, which was less than half those of F ewes (3.51 and 2.86 lambs, respectively). Both traits increased progressively with an increase in F breeding in crosses and with advances in age. DLS ewes weaned 1.22 lambs compared to 2.03 lambs for F ewes and 1.84 lambs for 4/8 F ewes. The heaviest litters at weaning (31.7 kg) were raised by 4/8 F ewes, followed by 7/8 F (30.8 kg) while those raised by DLS ewes weighed 23.0 kg and F ewes 29.1 kg. Percentage of ova lost per ewe mated averaged 24% and ranged between 18% (DLS and 1/8 F) and 29% (6/8 F). About 3.6% of lambs were born dead and a further 13.8% died before weaning. Preweaning mortality rate was highest in F (22.9%) and lowest in 3/8 F (9.4%). Average kilograms of lambs weaned per ewe exposed was highest in 4/8 F (27.6 kg) followed by F (26.0 kg), whereas that of DLS was the lowest at 18.1 kg. The 4/8 F cross showed 25% heterosis in kg of lambs weaned per ewe exposed and 52.5% increase over DLS. Significant positive linear regressions were calculated for ovulation rate, litter size and preweaning mortality rate on proportion of Finnsheep breeding in crosses. The relation was quadratic for percent ova lost and lamb mortality at weaning. Yearling DLS females weighted 36 kg compared to 44 kg for F yearlings. However, at 5 yr of age DLS ewes weighed 62 kg, 5 kg heavier than F ewes. The heaviest ewes at all ages were the 4/8 F (45 kg at 1 yr, 65 kg at 5 yr). Key words: Reproduction, DLS sheep, Finnsheep, crossbreeding, heterosis, repeatabilities

scholarly journals THE EFFECT OF THE DOE WEIGHT ON HER REPRODUCTIVE EFFICIENY

2021 ◽  
Vol 22 (1) ◽  
pp. 131-142
Author(s):  
Mohammad Ebrahim Ahmed ◽  
Hussain Yawr Hussain
Keyword(s):  
Growth Rate ◽  
Litter Size ◽  
Conception Rate ◽  
The Other ◽  
Gestation Period ◽  
Reproductive Efficiency ◽  
Litter Weight ◽  
The Third ◽  
Other Hand

Thirty-six local dose have been used and were divided in to three groups sacording to weight, in each group twelve dose. In the first group the weights of the dose were higher than ( 2.5 kgs) and less than (3 kgs). The second groups was higher than 3 kgs) and less than (3.5 kgs). The third group was higher than (3.5 kgs) and less than (4 kgs). The aim of this study was to obtain the effect of doe weight on her reproductive efficiency (gestation period, litter size, litter weight at birth and weaning, growth rate of offspring preweaning, conception rate and preweaning mortility).  The weight of the doe had no significant effect upon the gestation period and this period was 30.9, 31.2, 31.3 days for the three groups respectively, on the other hand the litter size was affected significantly by doe weight and litter size was at birth and preaweaning (5.1 , 5.8 and 6.2), (4.5, 5.3 and 5.7) for the three groups respectively. The offspring weight at birth and weaning was affected significantly by doe weight and this weight was (40.1 , 48.2 and 53.3 gms), (203.6, 227.5 and 233.8 gms) for the three groups respectively while the conception rate was not affected by doe weight. The mortility percentage in the prewaning period was not significantly by doe weight

scholarly journals 166 The effect of late lactation and pre-breeding nutrition on reproductive outcomes in an accelerated lambing system

2019 ◽  
Vol 97 (Supplement_3) ◽  
pp. 173-173
Author(s):  
Richard A Ehrhardt ◽  
Jordan Moody ◽  
Barbara Makela ◽  
Veiga-Lopez Almudena
Keyword(s):  
Litter Size ◽  
Body Condition Score ◽  
Dietary Treatment ◽  
Conception Rate ◽  
Energy Requirements ◽  
Breeding Period ◽  
Reproductive Outcomes ◽  
Long Day ◽  
Condition Score ◽  
Embryonic Loss

Abstract Productivity and seasonal constraints in lamb production can be overcome with accelerated systems. Accelerated adoption, however, has been limited by seasonal constraints in reproduction. Preliminary data suggest that periconceptional nutrition affects reproduction in the sub-optimal, long day breeding season. To evaluate this, we randomly assigned prolific, multiparous, Polypay x Dorset ewes at mid-lactation to nutritional treatments (5) over 2 periods: last 30 days of lactation (LACT) followed by the flushing period (FLUSH) consisting of the 21-day pre-breeding and the 34-day breeding period (total 55 days). During LACT, ewes were fed 100% (C), 70% (Low), or 150% (High) of late lactation energy requirements according to lamb rearing status (single or multiple). At FLUSH, Low or High ewes were fed either 70% (Low) or 150% (High) of energy requirements for maintenance (C ewes fed at 100% maintenance during FLUSH). This design was repeated over two seasons: optimal (SHORT day, n = 117) and suboptimal (LONG day, n = 108) breeding periods at 42.73°N and 84.5°W. Ewes were exposed to Dorset rams in 5 pens at 4–5% rotated every 12h. Reproductive outcomes were examined by ultrasound (transabdominal for litter size and conception rate; transrectal for early pregnancy loss). GLM analysis revealed changes in bodyweight and body condition score (BCS) consistent between seasons (Table 1). Regardless of dietary treatment, litter size was higher in SHORT (P < 0.05), while embryonic loss tended to be higher in LONG season (P = 0.08). Within season, treatment had no effect on reproductive outcomes, however prolonged undernutrition (Low-Low) reduced conception rate in LONG vs. SHORT season (100 vs.78%; P < 0.05). These results indicate that 1) high conception rates in LONG are attainable with natural mating and 2) chronic undernutrition hampers conception during long day periods. Finally, traditional flushing protocols are inadequate to invoke an optimal ovulation response regardless of season in accelerated systems.

Variation in the Seasonal Oestrus Period in Three Breeds of Greek Sheep

1988 ◽  
Vol 1988 ◽  
pp. 90-90
Author(s):  
A. Vosniakou ◽  
P. Tsakalof ◽  
J.M. Doney
Keyword(s):  
Litter Size ◽  
Live Weight ◽  
Early Summer ◽  
Conception Rate ◽  
Ovulation Rate ◽  
Breeding Period ◽  
Mating Period ◽  
Plasma Progesterone ◽  
Intermediate Activity ◽  
Natural Mating

The preferred mating period in Greece is spring and early summer. Conception rate to natural mating at the end of one oestrus period or early in the next is low, leading to a lengthy lambing period. Some 10% of flocks are synchronised during this period by a standard progestagen/PMSG treatment. There is considerable variation in ovulation rate, conception rate and litter size which could be related to within-flock variation in oestrous activity.Fourteen adult ewes from each of three breeds -Chios, Karagouniko and Serres - were maintained as a single flock at Diavata (latitude 40.5°N), without mating, from the end of the milking period in September. From the following April, oestrous activity was checked daily by vasectomised ram for 18 months. Live weight was maintained approximately constant at 59, 54 and 54 kg, respectively, for Chios, Karagouniko and Serres. Plasma progesterone was measured 10 days after detected oestrus and after 28 days when there was no intermediate activity. A silent oestrus in the breeding period was counted as oestrus but when it occurred prior to the first or after the last detected oestrus, it was not used to determine the breeding period.

Effect of body weight on the attainment of puberty and reproductive performance of Galway and Fingalway female lambs

1979 ◽  
Vol 28 (3) ◽  
pp. 297-307 ◽  
Author(s):  
J. F. Quirke
Keyword(s):  
Body Weight ◽  
Breeding Season ◽  
Litter Size ◽  
Conception Rate ◽  
Restricted Feeding ◽  
Ewe Lambs ◽  
Younger Age ◽  
Body Weights ◽  
The Mean ◽  
Ad Libitum

ABSTRACTGroups of spring-born Galway (G) and Fingalway (F) ewe lambs were fed a concentrate diet either ad libitum (H) or at a restricted level (L) during the period 25 July to 16 October 1974 in order to induce differences in body weight at the start of the breeding season. The mean live weights of the GL, GH, FL and FH groups on 16 October 1974 were 37·8 ± 1·3, 44·6 ± 1·3, 35·1 ± 1·1 and 41·9 ± 1·2 kg respectively. More than 95% of the lambs in all four groups attained puberty before 28 February 1975. Galway ewe lambs reached puberty later in the breeding season and were older and heavier at puberty than Fingalways. Animals fed ad libitum were heavier at puberty and attained puberty earlier in the season and at a younger age than those on the restricted feeding regime.Both conception rate and litter size were lower in Galways than Fingalways. There was no evidence of any effect of the nutritional treatments on conception rate or litter size. The mean body weights at puberty for ewes which lambed and those which were barren were 41·9 ± 0·49 and 41·5 ± 0·78 kg respectively. The birth weight and growth rate of the progeny of the ewe lambs was similar for the two breeds and was not influenced by the previous nutritional treatment of the dams. The total lamb mortality between birth and weaning was 40·3%, and 72% of all deaths occurred within 48 h of birth. Losses among twins (48%) were particularly heavy.

scholarly journals Sperm concentration on the intrauterine artificial insemination in swine

2009 ◽  
Vol 33 (6) ◽  
pp. 1671-1674
Author(s):  
Joana Miller ◽  
Ana Luísa Neves Alvarenga ◽  
Luis David Solis Murgas ◽  
Adriana Cristina da Silva ◽  
Ricardo Sales Araújo ◽  
...  
Keyword(s):  
Litter Size ◽  
Reproductive Performance ◽  
Artificial Insemination ◽  
Intrauterine Insemination ◽  
Sperm Concentration ◽  
Conception Rate ◽  
Cervical Canal ◽  
Significant Difference ◽  
Estrus Detection ◽  
Farrowing Rate

The aim of this work was to evaluate the efficiency of the intrauterine insemination (IUI) in swine, considering the conception rate, farrowing rate, litter size (alive born pigs). For the IUI, the females had been insemination at 24 and 48 hours after the estrus detection, and the inseminating doses of 500 million, 1 billion, 1.5 billion and 2 billion spermatozoa in 20 mL extender had been used. The procedure of catheter insertion through the cervical canal was successfully performed in 97.9% of the females. The conception rate was 6.3% in the IUI. The farrowing rate in IUI was 87.2% but the farrowing rate was 100% for the sperm concentration of 500 million. Regarding the number of born pigs and alive born pigs observed in females inseminated with IUI, no significant difference was observed (p > 0.05). The concentration of 500 x 10(6) spermatozoa in 20 mL extender in the intrauterine insemination resulted in an optimal reproductive performance.

scholarly journals Performance of Booroola Merino and Finnsheep crossbred lambs and ewes

1988 ◽  
Vol 60 (6) ◽  
pp. 492-499 ◽  
Author(s):  
L. D. Young ◽  
G. E. Dickerson
Keyword(s):  
Birth Weight ◽  
Survival Rate ◽  
Breeding Season ◽  
Litter Size ◽  
Conception Rate ◽  
Embryo Survival ◽  
Ewe Lambs ◽  
Significant Difference ◽  
Kidney Fat ◽  
The Difference

Booroola Merino (B, n= 18) and Finnsheep (F, n =31) rams were mated to F ewes and C3 ewes (1/2 Columbia, 1/4 Suffolk, 1/4 Hampshire). Progeny of these matings were evaluated for performance traits including ewe reproduction through 3 years of age. Averaged over dam breeds, there was no significant difference between B and F sires for conception rate (CR), litter size (LS) at birth or weaning or for lamb mortality to weaning. The difference among sire breeds was not large or significant for birth weight but F sired lambs were significantly heavier than B sired lambs at 63 and 147 days of age. Relative to F sired lambs, B sired lambs had a higher dressing percentage and less fat at the 12th rib but equal estimated percentage kidney fat. A significantly smaller percentage of B-C3 than F, F-C3 or B-F ewe lambs reached puberty by the end of their first breeding season. Ovulation rate at first mating was higher but embryo survival rate tended to be lower for B sired ewes than for F sired ewes. At 2 years of age, B sired ewes produced about 1 kg more wool than F sired ewes. With the exception of the very poor CR of B-C3 ewes at first parity, the differences between the four ewe genotypes were not large or significant for CR at first, second and third parity. The difference between B and F sired ewes in LS at birth was not significant at first parity but B sired ewes were more prolific at second and third parities. However, differences in lamb mortality reduced, and in some cases removed, the differences in LS by weaning time. Relative use of these breeds in commercial U.S. production schemes is discussed.

The efficiency of artificial insemination in pigs : lessons from australian research

1992 ◽  
Vol 1992 ◽  
pp. 58-58
Author(s):  
John Dunne
Keyword(s):  
The Netherlands ◽  
Litter Size ◽  
Artificial Insemination ◽  
Management Practices ◽  
Production Systems ◽  
Conception Rate ◽  
Substantial Part ◽  
Behavioural Changes ◽  
General Ability ◽  
Pig Farms

Recent years have seen a small but consistent growth in the use of AI on commercial pig farms in Britain. Currently about 12 percent of all matings are artificial and 25 percent or more of farms are using some AI.(6) This figure still falls well short of our continental neighbours, with Denmark and the Netherlands inseminating 50 percent of their sows. The conception rate and litter size achievable with AI (6) can at least equal results from natural matings. However, it is recognised that some people achieve far superior fertility results to others when using AI. Part of this is due to different genotypes employed (e.g. purebreds vs crossbreds), different production systems and management practices imposed. It is most likely, however, that an unquantified but substantial part of the reason for such big differences between farms in fertility following AI is due to differing abilities of stockpeople performing the inseminations. “Ability’ refers not only to the actual insemination technique, which is straightforward and can be quickly learned, but to their general ability to recognise behavioural changes in their stock, to interact with their stock and generally get the best out of their stock i.e. their level of stockmanship skills.

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