热应激条件下动物相关及环境因素对奶牛日产奶量的影响

IF 1.1 4区农林科学 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE

Mljekarstvo Pub Date : 2022-10-06 DOI:10.15567/mljekarstvo.2022.0406

N. Micic

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引用次数: 2

摘要

本研究旨在确定不同固定因素（品种、地区、产仔年、产仔季节、产次和泌乳阶段）对四个奶牛品种在热应激条件下（THI≥72）日产奶量（产量和含量）的影响。这项研究是对塞尔维亚共和国（马切瓦、波杜纳夫耶和Šumadija地区）饲养的四个奶牛品种（西门塔尔、荷斯坦-弗里斯安、红荷斯坦和棕色瑞士）的一组试验日记录进行的。统计分析包括2012年初至2019年底期间收集的测试日记录。根据所进行的分析，可以证明统计模型中包括的所有影响（品种、地区、产仔年、产仔季节、产次和哺乳期）在统计上高度显著（p＜0.001）影响了在热应激条件下饲养的奶牛的日产奶量（产量和含量）。波杜纳夫耶地区和荷尔斯泰因-弗里斯品种的日产奶量最高。此外，在以热应激为特征的环境中，春季、第三次哺乳期和哺乳期第61天至第120天产仔的奶牛在夏季产奶量最高。此外，在6月至9月期间，热应激环境中奶牛的日产奶量也有所下降。结果表明，不同的动物对热应激的反应与动物的品种、饲养区域、产仔年份、产仔季节、产次和泌乳阶段有关。

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The effect of animal-related and some environmental effects on daily milk production of dairy cows under the heat stress conditions

The study aimed to determine the effect of different fixed factors (breed, region, calving year, calving season, parity and lactation stage) on daily milk production (yield and content) of four dairy cattle breeds under the heat stress conditions (THI≥72). The research was conducted on a set of test-day records of four dairy cattle breeds (Simmental, Holstein-Friesian, Red Holstein and Brown Swiss) reared in the Republic of Serbia (Region of Mačva, Podunavlje and Šumadija). The statistical analysis included test-day records collected in the period from the beginning of the year 2012 to the end of the year 2019. Based on the performed analysis, it could be demonstrated that all the effects included in the statistical model (breed, region, calving year, calving season, parity and lactation stage) statistically highly significant (p<0.001) affected daily milk production (yield and content) of cows reared in the terms of the heat stress conditions. The highest daily milk production was determined in the region of Podunavlje, and by the Holstein-Friesian breed. Furthermore, dairy cows calved during the spring season, in the third lactation and from the 61st to the 120th day of lactation, had the highest milk production during the summer period in an environment characterised by heat stress. Also, daily milk yield of cows in a heat stress environment decreased in the period from June to September. The results obtained indicate different animals' responses to heat stress concerning the animal's breed, rearing region, calving year, calving season, parity and lactation stage.

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来源期刊

Mljekarstvo Agricultural and Biological Sciences-Animal Science and Zoology

CiteScore

1.90

自引率

41.70%

发文量

审稿时长

12 weeks

期刊介绍： Mljekarstvo is an open access, peer-reviewed international quarterly scientific journal. The first issue was published in 1951, by the Croatian Dairy Operators'' Association (today: Croatian Dairy Union, publisher). In a paper at a Union conference held 28 October 1951 in Zagreb it was said: "Our desire is that this magazine does not meet the fate of its predecessors, but that it continues to reflect the creative efforts and to provide guidelines for the producers as well as all other operators employed in the dairy industry." It is our pleasure today to say that wishes of the enthusiasts who attended the conference have come true, and the magazine Mljekarstvo during the last six decades was a reflection of the creative efforts of numerous dairy scientists and experts, and through its texts it served as a guideline in improving production and processing of milk and dairy products. Mljekarstvo has been following all the achievements of the dairy profession in Croatia, and it also gives the short surveys of world achievements. The result of the research of local and foreign scientists and experts always find their place in the magazine Mljekarstvo. It has been edited by our outstanding dairy experts employed at colleges, research institutions and dairy companies.