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首页> 外文期刊>Tropical Animal Health and Production >Relationship between performance, metabolic profile, and feed efficiency of lactating beef cows
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Relationship between performance, metabolic profile, and feed efficiency of lactating beef cows

机译：哺乳牛奶牛牛的性能，代谢剖面和饲料效率之间的关系

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Twenty-seven Nellore cow-calf pairs were submitted for feed efficiency testing. The animals were weighed every 21 +/- 5 days to obtain metabolic body weight (BW0.75) and average daily gain (ADG). Subcutaneous fat thickness (SFT; at 20, 83, 146, and 176 days post-calving); milk yield and components (63, 85, and 151 days); levels of glucose, cholesterol, triglycerides, beta-hydroxybutyrate, albumin, urea, creatinine, calcium, phosphorus, magnesium, insulin, and cortisol (15, 41, 62, and 124 days); and ingestive behavior were evaluated. Residual feed intake was calculated for the first stage (RFI1; 21 to 100 days post-calving) and the second stage of lactation (RFI2; 100 to 188 days post-calving), and the cows were classified based on RFI1 as most efficient (RFI1 0) and least efficient (RFI1 > 0). Negative RFI1 cows consumed 1.3 kg/day of dry matter, or 9.77%, less than positive RFI1 cows. Most- and least-efficient cows did not differ in terms of subcutaneous fat thickness traits and milk yield or energy-corrected milk (ECM). Glucose (P = 0.0785), triglycerides (P = 0.0795), and phosphorus (P = 0.0597) concentrations were higher in the first stage of lactation in most-efficient cows. Maternal characteristics such as calf weight at birth and at 205 days and ADG were similar in most- and least-efficient cows. The most-efficient cows are more economic as they consume less feed for the same level of production.
机译：提交了二十七位Nellore Cow-Calf对进行饲料效率测试。每21 +/- 5天称量动物，以获得代谢体重（BW0.75）和平均每日增益（ADG）。皮下脂肪厚度（SFT;在产犊后20,83,146和176天）;牛奶产量和组分（63,85和151天）;葡萄糖，胆固醇，甘油三酯，β-羟基丁酯，白蛋白，尿素，肌酐，钙，磷，镁，胰岛素和皮质醇（15,41,62和124天）;评估摄取行为。对第一阶段（RFI1; 21至100天后）和哺乳期的第二阶段（RFI2; 100至188天后的第二阶段）计算残余进料进口量，并根据RFI1为最有效的（ RFI1＆ 0）和最低有效（RFI1> 0）。负RFI1牛消耗1.3千克/天干物质，或9.77％，小于阳性RFI1奶牛。大多数和最低效率的奶牛在皮下脂肪厚度特征和牛奶产量或能量矫正牛奶（ECM）方面没有差异。葡萄糖（P = 0.0785），甘油三酯（P = 0.0795），并且在最有效的奶牛中泌乳的第一阶段含磷（P = 0.0597）浓度较高。母亲特性如出生时和205天的小牛重量和ADG在最高效的奶牛中相似。最有效的奶牛更加经济，因为它们消耗较少的饲料，以获得相同水平的生产水平。

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