Effects of production, season, age of cow, days dry, and days in milk on conception to first service in large commercial dairy herds

Journal of Dairy Science
J K HillersW N Fleming

Abstract

Effects of management and environmental factors on reproductive performance were evaluated as part of a fertility experiment in four large commercial dairy herds. The herds were selected because they utilized routine herd health programs, kept complete reproduction records on all cows, were enrolled in Dairy Herd Improvement, and would follow the protocol of the experiment. Only data from first services following parturition were utilized, and conception was determined by rectal palpation. Information on over 2800 experimental breedings was collected during 13 mo. Percentage conception to first service was not affected by milk production during current or previous lactations. However, cows with higher production during current or previous lactations. However, cows with higher production during current or previous lactation had longer intervals to first service. Previous days dry did not affect conception or interval to first service significantly. Conception was less for cows with less than 50 days to first service (32%) than for cows with over 50 days to first service (49 to 57%). No differences were found among 10-day intervals to first service of over 50 days. Cows in third and later lactation had lower reproductive performa...Continue Reading

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Citations

May 21, 2013·Journal of the American Veterinary Medical Association·Amanda H PlunkettAnita M Oberbauer
Nov 28, 2016·Journal of Dairy Science·Edel M MurphySean Fair
Jun 21, 2008·Journal of Dairy Science·M T KuhnH D Norman
Nov 1, 1987·Journal of Dairy Science·H HamudikuwandaR D Smith
May 1, 1989·Journal of Dairy Science·O PedronR Rizzi
Jun 1, 2001·Journal of Dairy Science·J S Clay, B T McDaniel
Dec 1, 1991·Journal of Dairy Science·W H HagemanW J Tyler
Oct 1, 1993·Journal of Dairy Science·R L Nebel, M L McGilliard
Jun 1, 1985·Journal of Dairy Science·J H Britt
Sep 1, 1989·Journal of Dairy Science·E Mäntysaari, L D Van Vleck
Nov 7, 2019·Frontiers in Veterinary Science·Madeleine J HayVictoria J Brookes
Mar 23, 2011·The Journal of Reproduction and Development·Minoru Sakaguchi
Jun 17, 2009·Journal of Dairy Science·H D NormanJ L Hutchison

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