Type

Journal Article

Authors

M G Diskin
A.C.O. Evans
P. Lonergan
J. F. Roche
M A Crowe
M. P. Mullen
M H Parr

Subjects

Veterinary

Topics
blood corpus luteum veterinary insemination artificial estrus detection corpus luteum maintenance physiology estrus synchronization progesterone female cattle pregnancy animals

Relationship between pregnancy per artificial insemination and early luteal concentrations of progesterone and establishment of repeatability estimates for these traits in Holstein-Friesian heifers. (2011)

Abstract Pregnancy per insemination is a major determinant of reproductive efficiency in cattle and is affected by concentrations of progesterone (P4) during early pregnancy. The relationship between pregnancy per artificial insemination (P/AI) and early luteal concentrations of P4, and repeatability of concentrations of P4 was examined on d 4, 5, 6, and 7 (day of standing estrus=d 0) in 118 Holstein Friesian heifers following 2 rounds of AI to 1 high-fertility sire. Repeatability estimates (R(e)) for P/AI were established following 4 rounds of AI. We found a linear and quadratic relationship between P/AI and concentrations of P4 on d 4 to 7 after estrus, as well as a linear and quadratic relationship between P/AI and the change in concentration of P4 from d 4 to 7 and from d 5 to 7. Optimum concentrations of P4 to maximize probability of P/AI were 2.5, 4.0, 5.0, 5.2, and 3.5 ng/mL for d 4, 5, 6, and 7, and the change from d 4 to 7, respectively. Repeatability of P/AI following 4 rounds of AI was low (R(e)=0.07). Repeatability estimates for concentrations of P4 from cycle to cycle indicated low repeatability between d 4 (R(e)=0.05) and 7 (R(e)=0.20). These data indicated the importance of P4 in the early luteal phase for pregnancy survival, but also demonstrated that high concentrations of P4 on these days have a deleterious effect on embryo viability. Early luteal (d 4 to 5) concentrations of P4 were a reasonable predictor of concentrations on d 7 and could be used as a diagnostic tool to identify animals at risk of subsequent embryo loss.
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Full list of authors on original publication

M G Diskin, A.C.O. Evans, P. Lonergan, J. F. Roche, M A Crowe, M. P. Mullen, M H Parr

Experts in our system

1
M G Diskin
Teagasc
Total Publications: 87
 
2
A.C.O. Evans
University College Dublin
Total Publications: 92
 
3
P. Lonergan
University College Dublin
Total Publications: 190
 
4
J. F. Roche
University College Dublin
Total Publications: 111
 
5
M A Crowe
University College Dublin
Total Publications: 101
 
6
Michael P. Mullen
Teagasc
Total Publications: 32
 
7
M H Parr
Teagasc
Total Publications: 11