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首页> 外文期刊>Journal of dairy research >Mammary gland development of dairy heifers fed diets containing increasing levels of metabolisable protein: metabolisable energy
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Mammary gland development of dairy heifers fed diets containing increasing levels of metabolisable protein: metabolisable energy

机译：饲喂含有增加水平的可代谢蛋白质的饲料的奶牛的乳腺发育：可代谢的能量

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摘要

This study was conducted to evaluate the development of the mammary gland in Holstein heifers subjected to different dietary metabolisable protein (MP): metabolisable energy (ME) ratios. Twenty-five Holstein heifers (initial body weight (BW) 213 ± 13.5 kg and initial average age 7.8 ±0.5 months) were divided into five treatments. The treatments were designed to provide MP: ME ratios equal to 33, 38,43,48, and 53 g of MP per Mcal of ME. All diets were formulated to have the same energy content (2.6 Mcal ME/kg dry matter). Actual MP: ME ratios were 36.2, 40.2, 46.2, 47.1, and 50.8 g MP/Mcal ME. The experiment was conducted in a randomised block design, while considering initial BW as a blocking factor to evaluate pre- and post-pubertal periods. Block effect was not observed for all variables evaluated; hence it was considered that the diets had the same influence both on pre- and post-pubertal phases. Dry matter and nutrient intake did not change between treatments, excepting protein intake and digestibility. Serum concentrations of insulin-like growth factor 1 increased linearly across treatments. Changes in the pixel brightness of mammary gland ultrasound images, which are associated with lipid content, were significantly influenced by MP:ME ratios in the diet of heifers that were subjected to accelerated growth rates. It is not recommended to use diets of less than 38 g MP/Mcal ME in diets to heifers allowed to gain more than 1 kg/d.
机译：进行这项研究是为了评估荷斯坦母牛在不同饮食中可代谢蛋白质（MP）：可代谢能量（ME）比率下乳腺的发育情况。将二十五个荷斯坦小母牛（初始体重（BW）213±13.5千克，初始平均年龄7.8±0.5个月）分为五种处理方法。这些处理被设计为提供的MP：ME比例等于每Mcal ME的33、38、43、48和53 g MP。所有日粮均具有相同的能量含量（2.6 Mcal ME / kg干物质）。实际的MP：ME比率为36.2、40.2、46.2、47.1和50.8 g MP / Mcal ME。该实验以随机区组设计进行，同时考虑初始体重作为评估青春期前后的一个障碍因素。没有观察到所有评估变量的阻滞作用；因此，人们认为饮食对青春期前后都有相同的影响。处理之间干物质和营养摄入量没有变化，蛋白质摄入量和消化率除外。胰岛素样生长因子1的血清浓度在所有治疗中均呈线性增加。与脂质含量相关的乳腺超声图像像素亮度的变化受到小母牛饮食中MP：ME比率的显着影响，小母牛饮食中的MP：ME比率受到加速。不建议在允许日增重超过1 kg / d的小母牛日粮中使用MP / Mcal ME少于38 g的日粮。

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  • 来源
    《Journal of dairy research》 |2015年第1期|113-120|共8页
  • 作者

    Ronan L Albino; Marcos I Marcondes; Robert M Akers; Edenio Detmann; Bruno C Carvalho; Tadeu E Silva;

  • 作者单位

    Animal Science Department, Federal University of Vicosa, Vicosa, Minas Gerais 36571 -000, Brazil;

    Animal Science Department, Federal University of Vicosa, Vicosa, Minas Gerais 36571 -000, Brazil;

    Department of Dairy Science, Virginia Polytechnic Institute and State University, Blacksburg 24061, USA;

    Animal Science Department, Federal University of Vicosa, Vicosa, Minas Gerais 36571 -000, Brazil;

    Embrapa Gado de Leite, Juiz de Fora, Minas Gerais 36038-330, Brazil;

    Embrapa Gado de Leite, Juiz de Fora, Minas Gerais 36038-330, Brazil;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Heifer; mammary gland; ultrasound;

    机译：小母牛乳腺超音波;

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