Milk somatic cell count affects feed efficiency through increased heat production of lactating dairy cows

IF 1.8 3区农林科学 Q2 AGRICULTURE, DAIRY & ANIMAL SCIENCE Livestock Science Pub Date : 2024-05-06 DOI:10.1016/j.livsci.2024.105479

Pekka Huhtanen, Ali-Reza Bayat

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Abstract

The objective was to evaluate the relationships between somatic cell count (SCC) and feed efficiency using the data from two respiration chamber studies using Nordic Red cows (n = 136). The cows were fed ad libitum a total mixed ration (forage: concentrate 45:55 on dry matter (DM) basis) containing 162 and 379 g crude protein and neutral detergent fibre in kg DM, respectively. Average (± SD) DM intake and energy corrected milk (ECM) yield were 23.6 ± 3.4 and 37.7 ± 6.1 kg/d, respectively. Blood samples were collected in one of the studies (n = 86). Feed efficiency was expressed as ECM/DM intake, residual feed intake (RFI) and residual ECM yield (RECM). Feed efficiency decreased significantly with increased SCC irrespective of how the efficiency was expressed. Data from energy metabolism indicated that conversion of dietary gross energy to metabolizable energy (ME) was not influenced by SCC, but the efficiency of ME utilization decreased as a result of increased heat production. Increased heat production might be associated with the greater energy demand for immune function. Blood haptoglobin increased with SCC also indicating the role of immune function in increased heat production. Methane intensity increased by 1.0 g/kg ECM above cut-off value of 47 000 cells/mL. It is concluded that in addition to economic losses and animal welfare issues, increased milk SCC has negative environmental impact.

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牛奶体细胞数通过增加泌乳奶牛的产热影响饲料效率

目的是利用北欧红牛（n = 136）的两项呼吸室研究数据，评估体细胞数（SCC）与饲料效率之间的关系。奶牛自由采食混合日粮（按干物质（DM）计算，饲草与精料的比例为 45:55），其中粗蛋白和中性洗涤纤维的含量分别为 162 克和 379 克（以千克 DM 计）。平均（± SD）DM 摄入量和能量校正奶（ECM）产量分别为 23.6 ± 3.4 kg/d 和 37.7 ± 6.1 kg/d。其中一项研究采集了血液样本（n = 86）。饲料效率用 ECM/DM摄入量、剩余饲料摄入量 (RFI) 和剩余 ECM 产量 (RECM) 表示。无论效率如何表示，饲料效率都随着 SCC 的增加而明显下降。能量代谢数据表明，日粮毛能转化为代谢能（ME）不受 SCC 的影响，但由于产热量增加，ME 的利用效率降低。产热增加可能与免疫功能需要更多能量有关。血液隐血红蛋白随 SCC 的增加而增加，这也表明免疫功能在产热增加中的作用。甲烷强度比 47 000 cells/mL 临界值高 1.0 g/kg ECM。结论是，除了经济损失和动物福利问题外，牛奶 SCC 的增加还会对环境造成负面影响。

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来源期刊

Livestock Science 农林科学-奶制品与动物科学

CiteScore

4.30

自引率

5.60%

发文量

237

审稿时长

3 months

期刊介绍： Livestock Science promotes the sound development of the livestock sector by publishing original, peer-reviewed research and review articles covering all aspects of this broad field. The journal welcomes submissions on the avant-garde areas of animal genetics, breeding, growth, reproduction, nutrition, physiology, and behaviour in addition to genetic resources, welfare, ethics, health, management and production systems. The high-quality content of this journal reflects the truly international nature of this broad area of research.