Journal article
Single appointment insemination for heifers after prostaglandin or progestin synchronization of estrus
Theriogenology, Vol.31(6), pp.1233-1238
1989
Handle:
https://hdl.handle.net/2376/107586
PMID: 16726642
Abstract
Pregnancy rates to a single appointment insemination were compared in seven groups of beef or dairy heifers following estrus synchronization with the prostaglandin F
2a product, cloprostenol, versus the progestín product, Syncro-Mate-B. For cloprostenol synchronization, two injections of cloprostenol were given 11 d apart, with insemination occurring at 61±1 h after the second injection. The Syncro-Mate-B treatment consisted of a norgestomet/estradiol injection and a norgestomet implant on Day 0, followed by insemination at 49±1 h after implant removal on Day 9. Treatments were coordinated so all heifers in each group were housed together at the time of and for 48 h before a common insemination time so that the treatment received by individual heifers was not known. Overall pregnancy rates did not differ between treatment groups: 42% for 111 heifers treated with cloprostenol and 38% for 108 heifers treated with Syncro-Mate-B. Four blood samples per heifer taken during each replicate showed that two groups (n = 67) had many noncyclic heifers, while five groups (n = 152) had very few. Differences in pregnancy rates between these categories existed for both estrus synchronization methods, 18 versus 53% for cloprostenol and 21 versus 45% for Syncro-Mate-B. Thus the two methods were equally effective for cyclic heifers and equally ineffective for noncyclic heifers.
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Details
- Title
- Single appointment insemination for heifers after prostaglandin or progestin synchronization of estrus
- Creators
- B.E SeguinH.W MomontH FahmiM FortinA Tibary
- Publication Details
- Theriogenology, Vol.31(6), pp.1233-1238
- Academic Unit
- Veterinary Clinical Sciences, Department of
- Publisher
- Elsevier Inc
- Identifiers
- 99900548454501842
- Language
- English
- Resource Type
- Journal article