Influence of lambing-to-rebreeding interval on ewe reproductive performance in anestrous season
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چکیده
منابع مشابه
Anestrous Estrous Season Season Breeding Breeoing January June October Artificial Insemination / ~ Plasma L Assays Lambing
The influence of pregnant mares' serum gonadotropin (PMSG) on reproductive performance of sheep bred by artificial insemination (AI) was studied in the anestrous and estrous seasons. Ewes were treated with progestogenimpregnated intravaginal sponges in June and October. One-half of the ewes in each trial received PMSG at sponge removal and were inseminated 55 h after sponge removal. One-half of...
متن کاملefficacy of gnrh or cidr on out of season reproductive performance of ewe
abstract: an investigation was under taken to evaluate the out of season reproduction performance of ewe. a flock consisting 119 ewes was synchronized via implementation cidr over a period of 12 days, following by injection of pmsg (400 iu). the ewes inseminated and divided to three experimental groups. group1: injection of gnrh (5ml) at day 12 post insemination, group 2: received cidr for 5 to...
متن کاملEffects of ewe age and season of lambing on prolificacy in US Targhee, Suffolk, and Polypay sheep.
Factors affecting ewe prolificacy (number of lambs born per ewe lambing) were evaluated using records on 9705 Targhee, 12,721 Suffolk, and 7231 Polypay lambings from flocks participating in the US National Sheep Improvement Program. Factors considered were ewe age and season of lambing. Prolificacy was affected by age of the ewe (P<0.001) and was highest for ewes lambing between 4 and either 7 ...
متن کاملResponse of Breeds to Exogenous Hormones in Ewes
Three experiments were conducted, using 1,488 ewes during seasonal anestrous and during the normal estrous period, to evaluate the influence of breed on response to exogenous hormones. Treatment was intravaginal, progestogen pessaries Days 1 to 16, 10 mg crystalline progesterone on Day 16, followed by 750 IU PMS on Day 17. In the anestrous ewes a second PMS injection was given on Day 32 in one ...
متن کاملThe effect of ewe body condition at lambing on colostral immunoglobulin G concentration and lamb performance.
Body condition was scored at lambing (BCSL) on 101 mature (4 to 7 yr old) Polypay ewes and related to colostral immunoglobulin G (IgG) concentration and lamb performance. Colostrum samples were collected from each ewe within 12 h of lambing and litters of more than two lambs were reduced to two within 2 h of lambing. Colostral IgG concentrations decreased rapidly with time (b = -3.28; R2 = .213...
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ژورنال
عنوان ژورنال: Canadian Journal of Animal Science
سال: 2002
ISSN: 0008-3984,1918-1825
DOI: 10.4141/a01-098