Effects of three prepubertal body growth rates on performance of Holstein heifers during first lactation

Journal of Dairy Science
M E Van AmburghH N Erb

Abstract

The effects of body weight (BW) gain, different sources of protein during the prepubertal period (90 to 320 kg of BW), and the performance of Holstein heifers during their first lactation were studied. Heifers (n = 273) were assigned to one of three dietary energy treatments that were designed to achieve average daily gains of 0.6, 0.8, and 1.0 kg/d. Within each energy treatment, different protein sources (plant protein and urea or both plant and animal proteins) were imposed. Actual average daily gains by heifers on each energy treatment were 0.68, 0.83, and 0.94 kg/d for heifers that were fed diets formulated for average daily gains of 0.6, 0.8, and 1.0 kg/d, respectively, which allowed the following ages at first calving: 24.5, 22.0, and 21.3 mo. Breeding was initiated when heifers weighed approximately 340 kg. Protein sources did not affect average daily gain or milk yield. Analysis of the preplanned comparisons of actual 305-d and 4% fat-corrected milk yields indicated that yield was significantly reduced for heifers grown at 0.94 kg/d (9387 and 8558 kg, respectively) compared with that of heifers grown at 0.68 kg/d (9873 and 9008 kg, respectively). However, further regression analysis of fat-corrected milk and residual mi...Continue Reading

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Citations

Dec 1, 2010·Animal : an International Journal of Animal Bioscience·L VilleneuveP Lacasse
Apr 5, 2014·Animal : an International Journal of Animal Bioscience·D C WathesJ S Cooke
Jan 21, 2014·Journal of Dairy Science·W K CoblentzM G Bertram
Oct 4, 2016·Journal of Dairy Science·E BonfanteA Formigoni
Jun 19, 2018·The Journal of Dairy Research·Clémence PanzutiFrédéric Dessauge
Mar 22, 2012·American Journal of Human Biology : the Official Journal of the Human Biology Council·Elizabeth A QuinnChristopher W Kuzawa
Oct 6, 1999·Journal of Dairy Science·D G FoxT P Tylutki
Apr 5, 2001·Journal of Dairy Science·J BewleyD B Jackson-Smith
Aug 1, 2008·Animal : an International Journal of Animal Bioscience·D C WathesZ Cheng
Sep 1, 2008·Animal : an International Journal of Animal Bioscience·Y Le CozlerC Disenhaus
Dec 12, 2012·Journal of Dairy Science·N Mohd NorH Hogeveen
Jan 28, 2012·Journal of Dairy Science·F SoberonM E Van Amburgh
Oct 13, 2009·Journal of Animal Science·M EngstromN R St-Pierre

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