Type

Journal Article

Authors

M G Diskin
T Fair
A.C.O. Evans
P. Lonergan
M A Crowe
M H Parr

Subjects

Veterinary

Topics
negative energy balance live weight fatty acids feed intake heifers dairy cow term pregnancy energy intake

The concurrent and carry over effects of long term changes in energy intake before insemination on pregnancy per artificial insemination in heifers. (2014)

Abstract Follicle development in a period of negative energy balance (NEB), as experienced by the postpartum dairy cow, could be affected by undesirable metabolic changes, and may contain a developmentally incompetent oocyte with an impaired potential to establish a pregnancy. A differential feeding model in heifers was developed to evaluate the concurrent and carryover effects of reduced energy intake before insemination on pregnancy per artificial insemination (P/AI). Heifers were randomly assigned to either (i) control feed intake group (CF), n=68, 1.3 times estimated maintenance energy (M) requirements for 50 days and 2.0 M for 83 days or (ii) restricted feed intake (RF), n=88, 0.65 M for 50 days and 2.0 M for 83 days. Pregnancy per AI was determined by transrectal ultrasonography at day 30 following AI. Despite significant loss of live weight (LW; 5.8±2.1 vs 70.5±2.8kg, respectively) and body condition score (BCS; 0.05±0.03 vs 0.45±0.03) and a significant elevation in systemic concentrations of non-esterified fatty acids in RF heifers, there was no concurrent effect on P/AI (69 vs 72%) following AI at day 50. However, there was a carryover effect on P/AI as there was an 18 percentage point difference (64 vs 82%) between CF and RF heifers following AI on day 93. The results of the study indicate that a reduction in energy intake for a 50-day period pre-insemination had no concurrent effect but had a positive carryover effect on P/AI.
Collections Ireland -> Teagasc -> PubMed

Full list of authors on original publication

M G Diskin, T Fair, A.C.O. Evans, P. Lonergan, M A Crowe, M H Parr

Experts in our system

1
M G Diskin
Teagasc
Total Publications: 87
 
2
T Fair
University College Dublin
Total Publications: 66
 
3
A.C.O. Evans
University College Dublin
Total Publications: 92
 
4
P. Lonergan
University College Dublin
Total Publications: 190
 
5
M A Crowe
University College Dublin
Total Publications: 101
 
6
M H Parr
Teagasc
Total Publications: 11