Presynchronization of estrous cycles in dairy cows before ovsynch + CIDR and resynchronization of repeat estrus using the CIDR
نویسندگان
چکیده
منابع مشابه
Eazi-BrEEdTM CIDR® Cattle Insert for Induction of Estrous Cycles in Anestrous Lactating Dairy Cows
Though conception rates within 2 weeks of Eazi-BrEEd CIDR removal were lower for treated cows (27.7% vs 36.2% for controls, P < 0.083), overall pregnancy rates did not differ between treatment groups (P = 0.32). [Conception can be reduced by: 1) an older, unknown-aged egg being ovulated after an extended progesterone period; 2) vaginitis, so cleanliness and proper insertion technique are impo...
متن کاملeffect of three methods of estrus synchronization :ovsynch, cidr+ovsynch and presynch+ovsynch on the fertility of dairy cows
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متن کاملReview of Estrous Syncrhonization Systems: Cidr Inserts
Introduction Although estrous synchronization has been cited over the past several decades to have significant impact on reproductive performance of beef cattle (Schafer et al., 1990), only a limited percent of beef cattle operations in the U.S. synchronize estrus. In a summary by the National Animal Health Monitoring Systems (NAHMS) only 3.3% of beef cattle in the U.S. were being synchronized ...
متن کاملReview of Estrous Synchronization Systems : Cidr
The CIDR is an intravaginal progesterone insert, used in conjunction with other hormones to synchronize estrous in beef and dairy cows and heifers. The CIDR was developed in New Zealand and has been used for several years to advance the first pubertal estrus in heifers and the first postpartum estrus in cows. The CIDR is a “T” shaped device with flexible wings that collapse to form a rod that c...
متن کاملComparison of Pregnancy Rates after Timed Artificial Insemination in Ovsynch, Heatsynch and CIDR-Based Synchronization Protocol in Dairy Cows
The objective of this study was to compare the effects of three different estrus synchronization protocols on the pregnancy rates of lactating dairy cows. Group 1 (Ovsynch protocol; n= ) animals received 20 μg GnRH on day 0, 500 μg PGF2α on day 7 and 20 μg GnRH on day 9; Group 2 (Heatsynch protocol; n= ) received 20 μg GnRH on day 0, 500 μg PGF2α on day 7 and an injection of 1 ml estradiol cypi...
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ژورنال
عنوان ژورنال: Kansas Agricultural Experiment Station Research Reports
سال: 2001
ISSN: 2378-5977
DOI: 10.4148/2378-5977.3221