湿热条件下饲粮蛋白质水平对泌乳中期奶牛瘤胃代谢和产奶量的影响

Wandee Thiangtum, J. T. Schonewille, A. Yawongsa, T. Rukkwamsuk, J. Kanjanapruthipong, M. Verstegen, W. Hendriks
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引用次数: 2

摘要

本试验旨在研究2个水平的瘤胃不可降解蛋白(RUP)比例相近的精料饲粮中粗蛋白质(CP)对泰国泌乳中期奶牛瘤胃代谢、产奶量和乳成分的影响。采用8头87.5%荷斯坦奶牛和12.5%土着奶牛进行交叉试验,每隔25 d进行两次试验。以干物质(DM)为基础,饲粮中添加30%段草和70%精料。精料饲料提供较低的饲粮粗蛋白质(17.3%;低粗蛋白质)或高粗蛋白质(19.04%;HCP)。两种饲粮中瘤胃可降解蛋白(RDP)和RUP的比例分别为61%和39%。在哺乳的净能量方面,饮食是等热量的。饲喂HCP的奶牛产奶量、乳糖产量、干物质采食量(DMI)以及DM、CP和中性洗涤纤维(NDF)的表观消化率均高于饲喂LCP的奶牛。HCP饲粮提高了奶牛血尿素氮浓度。饲喂HCP饲粮的奶牛瘤胃NH3-N浓度和pH有升高的趋势。瘤胃微生物计数和挥发性脂肪酸水平在不同处理之间没有差异。提高泌乳中期奶牛粗蛋白质含量有利于提高DMI、DM、CP和NDF的表观消化率,从而提高产奶量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of dietary protein levels on rumen metabolism and milk yield in mid-lactating cows under hot and humid conditions.
An experiment was conducted to investigate the effects of 2 levels of dietary Crude Protein (CP) in concentrates with similar proportions of Rumen Undegradable Protein (RUP) on rumen metabolism, milk yield and composition in mid lactating cows in Thailand. Eight 87.5% Holsteinx12.5% indigenous multiparous cows were used in a crossover design with two successive 25 days periods. Diets contained 30% paragrass and 70% concentrate on a Dry Matter (DM) basis. Concentrate feeds were formulated to provide low dietary CP (17.3%; LCP) or high dietary CP (19.04%; HCP). The proportion of Rumen Degradable Protein (RDP) and RUP was 61 and 39% in both diets. Diets were isocaloric in terms of net energy for lactation. Milk yield, milk lactose yield, Dry Matter Intake (DMI) and apparent digestibility of DM, CP and Neutral Detergent Fiber (NDF) were greater in cows fed HCP than in those fed LCP. Concentration of blood urea nitrogen was elevated in cows fed HCP diets. Rumen NH3-N concentration and pH tended to increase in cows fed HCP diet. Rumen microorganism counts and volatile fatty acids levels in the rumen did not differ between treatments. The increasing CP content in mid-lactating cow was beneficial to increase DMI, apparent digestibility of DM, CP and NDF and therefore milk yield.
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来源期刊
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期刊介绍: Journal of Animal Veterinary advances is a peer-reviewed, open-access scientific journal which publishes articles related to experiments, treatment, analysis, biological elements and other methods of research connected with veterinary. JAVA started publishing activity in 2002, since that time is updated twice a month, and is available in online and print formats. The publications are reviewed by Editorial Board in accordance with the standards and novelty of the subject, while strictly following ethical guidelines. Subject areas suitable for publication include, but are not limited to the following fields :: Veterinary science :: Animal husbandry :: Animal nutrition :: Anatomy :: Biological science :: Pathology :: Infectious diseases :: Animal physiology :: Animal breeding :: Animal biotechnology :: Transgenic animal production :: Animal parasitology :: Veterinary medicine :: Animal feed and nutrition :: Equine​.
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