Energy balance influences number of ovulations rather than embryo quality in the pig

The present study was undertaken to examine the effect of feed restriction on ovulation rate and in vivo blastocyst development in gilts and sows. In the first experiment, gilts were feed restricted (1 vs. 2.5 times maintenance requirement) during the luteal and follicular phases before ovulation. I...

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Published in:Theriogenology 2016-09, Vol.86 (4), p.1008-1013
Main Authors: Langendijk, Pieter, Chen, Tai-Yuan, McIlfatrick, Stephen M., Nottle, Mark B.
Format: Article
Language:English
Subjects:
Animals
Blastocyst - physiology
Embryo
Energy balance
Energy Metabolism - physiology
Female
Food Deprivation - physiology
Ovulation
Ovulation - physiology
Parity
Pregnancy
Swine
Swine - embryology
Swine - physiology
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description The present study was undertaken to examine the effect of feed restriction on ovulation rate and in vivo blastocyst development in gilts and sows. In the first experiment, gilts were feed restricted (1 vs. 2.5 times maintenance requirement) during the luteal and follicular phases before ovulation. In the second experiment, primiparous sows were feed restricted (ad lib vs. 60% thereof) during the last week of lactation before weaning. Gilts and sows were slaughtered at 5 days after ovulation to determine ovulation rate and blastocyst development. Blastocysts were also differentially stained to determine the effect of feed restriction on total, trophectoderm, and inner cell mass cell numbers. In both experiments, feed restriction delayed ovulation and reduced the number of ovulations in gilts (14.8 ± 1.3 vs. 12.0 ± 0.2; P 
doi_str_mv 10.1016/j.theriogenology.2016.03.029
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In the first experiment, gilts were feed restricted (1 vs. 2.5 times maintenance requirement) during the luteal and follicular phases before ovulation. In the second experiment, primiparous sows were feed restricted (ad lib vs. 60% thereof) during the last week of lactation before weaning. Gilts and sows were slaughtered at 5 days after ovulation to determine ovulation rate and blastocyst development. Blastocysts were also differentially stained to determine the effect of feed restriction on total, trophectoderm, and inner cell mass cell numbers. In both experiments, feed restriction delayed ovulation and reduced the number of ovulations in gilts (14.8 ± 1.3 vs. 12.0 ± 0.2; P &lt; 0.05) and in sows (19.9 ± 1.0 vs. 18.4 ± 0.7). The number of blastocysts recovered on Day 5 was similarly reduced in gilts (12.0 ± 1.7 vs. 9.1 ± 1.1; P &lt; 0.10) and in sows (15.9 ± 1.5 vs. 14.7 ± 1.0). However, feed restriction did not affect total, trophectoderm, or inner cell mass cell numbers in gilts or sows. In conclusion, the present study reported that energy balance influences ovulation rate and blastocyst number rather than blastocyst viability as measured by cell number.</description><identifier>ISSN: 0093-691X</identifier><identifier>EISSN: 1879-3231</identifier><identifier>DOI: 10.1016/j.theriogenology.2016.03.029</identifier><identifier>PMID: 27125697</identifier><language>eng</language><publisher>United States: Elsevier Inc</publisher><subject>Animals ; Blastocyst - physiology ; Embryo ; Energy balance ; Energy Metabolism - physiology ; Female ; Food Deprivation - physiology ; Ovulation ; Ovulation - physiology ; Parity ; Pregnancy ; Swine ; Swine - embryology ; Swine - physiology</subject><ispartof>Theriogenology, 2016-09, Vol.86 (4), p.1008-1013</ispartof><rights>2016 Elsevier Inc.</rights><rights>Copyright © 2016 Elsevier Inc. 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However, feed restriction did not affect total, trophectoderm, or inner cell mass cell numbers in gilts or sows. 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source ScienceDirect Journals
subjects Animals
Blastocyst - physiology
Embryo
Energy balance
Energy Metabolism - physiology
Female
Food Deprivation - physiology
Ovulation
Ovulation - physiology
Parity
Pregnancy
Swine
Swine - embryology
Swine - physiology
title Energy balance influences number of ovulations rather than embryo quality in the pig
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