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Advances in Animal and Veterinary Sciences

Research Article
Adv. Anim. Vet. Sci. 5(10): 425-435
Http://dx.doi.org/10.17582/journal.aavs/2017/5.10.425.435
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Yassin Najid1, Yvon Couture2, Sonia Chénier3, Alain Fournier4, Dany Cinq-Mars5, Younès Chorfi1, 6

1Département de Biomédecine Vétérinaire, Faculté de médecine vétérinaire - Université de Montréal, 3200 Sicotte St., P.O. Box 5000, Saint-Hyacinthe, QC, J2S 7C6, Canada; 2Département de Sciences cliniques – Université de Montréal; 3Département de pathologie et microbiologie - Université de Montréal; 4Ministère d’Agriculture, Pêcheries et Alimentation du Québec, 460 Boulevard Louis-Fréchette Nicolet J3T 1Y2, Canada; 5Département des Sciences Animales, Université Laval, 2425 Rue de l’agriculture Québec, QC, G1V 0A6, Canada.

Abstract | The aim of the study was to evaluate the impact of replacing the maize portion of the diet on growth, rumen health and blood chemistry of Holstein bull calves. A maize plus protein supplement feed (MS), a MS plus corn distiller’s dried grain with soluble matter (DDGS) feed (MSD), a maize plus canola meal plus DDGS feed (MCD), a barley plus canola meal plus DDGS feed (BCD), and a hay grass negative control feed (N) were all given ad libitum. Three-month-old bull calves were assigned randomly to MS, MSD, MCD and BCD, 80 animals per treatment, 10 per pen. An additional group of five bull calves were assigned to N. Blood HCO3-, anion gap, urea, glucose, pH, PCO2,L-lactate and lipopolysaccharide binding protein were measured. Daily duration below pH 5.6 (DpH5.6)in the rumen was logged. A mixed linear model (Proc Mixed) was used for data collected over time from individual animals. Histology results and liver rejections were analysed using a chi-square test (Proc Freq), and linear regressions to evaluate the relationships between DpH5.6 and ADG.MSD and MCD produced similar growth but did not decrease DpH5.6 or affect blood parameters. BCD decreased DpH5.6 and improved gain at the finishing phase but did not affect blood parameters. Diets had no effect on rumen epithelium and lamina propria, or on the frequency of liver abscesses. Partial or total replacement of maize by DDGS, barley and canola meal appears not to affect livestock performance.

Keywords | Rumen, Growth, Blood parameters, Grain-fed bull calves, Maize