Production response in dairy cows milked two or three times a day: A meta-analysis

IF 0.2 4区 农林科学 Q2 Veterinary
J. I. Sánchez-Duarte, Alvaro García, K. Rodríguez-Hernández, David G. Reta-Sánchez, Homero Salinas-González, E. Ochoa-Martínez, Arturo Reyes-González
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引用次数: 6

Abstract

The objective was to evaluate the effects of two (2×) vs three (3×) times per day milking on milk production and milk composition in dairy cows. Fourteen scientific papers, containing production data from 16 trials, where dairy cows were milked 2× or 3×, were analysed using meta-analysis with fixed and random-effects with the R statistical program. The degree of heterogeneity and publication bias were measured with the I2 statistic and Begg’s test, respectively. In addition, the meta-regression analysis explored other sources of heterogeneity for the response. The estimated effect size of 2× and 3× milkings was calculated for dry matter intake (DMI), milk production, and milk composition. Dry matter intake, milk production, and milk fat and protein yields showed substantial heterogeneity (I2>50%). Whereas milk fat-percentage had moderate heterogeneity (I2 .05). Cows milked 2× produced less milk (2.23 kg/d), less milk fat (0.06kg/d), and less milk protein (0.05 kg/d). In contrast, the fat percentage was lower (0.07 units) in 3×, compared with 2× milking frequency. There was no effect of milking frequency on DMI and milk protein percentage. In conclusion, milk production and milk fat and protein yields improves as milking frequency increase from 2× to 3× daily, without affecting DMI. The implementation of 3× milking frequency must consider dairy cow management, labor, and milking parlour infrastructure, particular to each dairy farm.
一天挤两到三次奶的奶牛的生产反应:一项荟萃分析
目的是评估每天两次(2x)与三次(3x)挤奶对奶牛产奶量和乳成分的影响。14篇科学论文,包含来自16个试验的生产数据,其中奶牛的挤奶次数为2倍或3倍,使用R统计程序进行固定效应和随机效应的荟萃分析。异质性程度和发表偏倚分别采用I2统计量和Begg检验。此外,荟萃回归分析还探讨了反应异质性的其他来源。计算了2次和3次挤奶对干物质采食量(DMI)、产奶量和乳成分的估计效应量。干物质采食量、产奶量、乳脂和蛋白质产量具有显著的异质性(2 ~ 50%)。而乳脂率具有中等异质性(i0.05)。挤奶2次的奶牛产奶量减少(2.23 kg/d),乳脂减少(0.06kg/d),乳蛋白减少(0.05 kg/d)。相比之下,3次挤奶时乳脂率较2次低(0.07单位)。挤奶频率对DMI和乳蛋白率没有影响。综上所述,当挤奶频率从每天2次增加到每天3次时,产奶量和乳脂、蛋白质产量均有所提高,但不影响DMI。实施3倍挤奶频率必须考虑奶牛管理、劳动力和挤奶室基础设施,特别是每个奶牛场。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Veterinaria Mexico
Veterinaria Mexico VETERINARY SCIENCES-
自引率
0.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: Veterinaria México OA (ISSN 2448-6760) is an online scientific journal edited by Universidad Nacional Autónoma de México (UNAM). The journal is Open Access and follows UNAM''s initiative, to transmit knowledge free of charge to the readership and authors, with no Article Processing Charges. This journal publishes advances in Veterinary Sciences and Animal Production, and to reach more lectures across the world the journal was updated since 2014 from its predecessor printed in paper Veterinaria México (ISSN 0301-5092) and its digital version (ISSN 2007-5472).
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