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- 저자 : Annette Forro (검색결과 1 건)
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Annette Forro,Georgios Tsousis,Nicola Beindorff,Ahmad Reza Sharifi,Christos Brozos,Heinrich Bollwein 대한수의학회 2015 Journal of Veterinary Science Vol.16 No.1
The objective of this study was to investigate factors that influence the success of resynchronization protocols for bovines with and withoutprogesterone supplementation. Cow synchronized and not found pregnant were randomly assigned to two resynchronization protocols:ovsynch without progesterone (P4) supplementation (n = 66) or with exogenous P4 administered from Days 0 to 7 (n = 67). Progesteronelevels were measured on Days 0 and 7 of these protocols as well as 4 and 5 days post-insemination. Progesterone supplementation raised theP4 levels on Day 7 (p < 0.05), but had no overall effect on resynchronization rates (RRs) or pregnancy per artificial insemination (P/AI). However, cows with Body Condition Score (BCS) > 3.5 had increased P/AI values while cows with BCS < 2.75 had decreased P/AI ratesafter P4 supplementation. Primiparous cows had higher P4 values on Day 7 than pluriparous animals (p = 0.04) and tended to have higherRRs (p = 0.06). Results of this study indicate that progesterone supplementation in resynchronization protocols has minimal effects onoutcomes. Parity had an effect on the levels of circulating progesterone at initiation of the protocol, which in turn influenced the RR.
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