Effects of timed insemination and supplemental beta-carotene on reproduction and milk yield of dairy cows under heat stress

Journal of Dairy Science
C F AréchigaP J Hansen

Abstract

In three experiments, we tested the efficacy of timed artificial insemination (AI) and beta-carotene supplementation for improvement of reproduction and milk yield. Experiments 1 and 2 were conducted during hot months, and Experiment 3 was conducted during cooler months. Cows were fed rations supplemented with beta-carotene at 0 or 400 mg/d per cow for > or = 15 d before the first AI. Cows were inseminated at each observed estrus after 70 d (Experiment 1) or at 50 d postpartum (Experiments 2 and 3) or were included in a timed AI program [d 0 (i.e., approximately 40 or 60 d postpartum), 8 micrograms of GnRH agonist; d 7, 25 mg of PGF2 alpha; d 9, 8 micrograms of GnRH agonist; d 10, AI] for first breeding. Pregnancy rate at first AI was similar among groups, but the percentage of cows that were pregnant by 90 d postpartum was greater for cows in the timed AI group in Experiments 1 (16.6% vs. 9.8%) and 2 (34.3% vs. 14.3%) but not in Experiment 3 (24.1% vs. 28.7%). Overall, beta-carotene had no effect on reproductive function. For cows fed supplemental beta-carotene for > or = 90 d, however, pregnancy rate at 120 d postpartum was increased in Experiment 1 (35.4% vs. 21.1%). In all experiments, beta-carotene increased cumulative mil...Continue Reading

References

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Citations

Feb 22, 2017·Theriogenology·F De RensisR J Scaramuzzi
Jul 20, 2005·Journal of Dairy Science·A R RabieeM A Stevenson
Aug 26, 2004·Journal of Dairy Science·J L LawrenceJ L Edwards
Jul 6, 2000·Journal of Dairy Science·F MoreiraW W Thatcher
Jul 21, 2015·Journal of Dairy Science·R C OliveiraM N Pereira
Feb 15, 2019·International Journal of Veterinary Science and Medicine·Alzahraa M AbdelattyAhmed Gad
Jul 7, 2018·Journal of Veterinary Research·Arkadiusz NowickiTomasz Janowski
Nov 30, 2019·Journal of Animal Physiology and Animal Nutrition·Abdul SammadYachun Wang
Jan 15, 2009·Journal of Animal Physiology and Animal Nutrition·G Arellano-RodriguezA Gonzalez-Bulnes
Aug 13, 2011·Reproductive Medicine and Biology·Masashi Takahashi
Jun 15, 2012·Animal Science Journal = Nihon Chikusan Gakkaihō·Hiroya KadokawaPeter J Hansen
Mar 26, 2013·Reproductive Biology·Cesar A Meza-HerreraFrancisco G Veliz-Deras
May 31, 2011·Biochimica Et Biophysica Acta·Elizabeth SpieglerLoredana Quadro

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