Effects of Rumen-Protected Niacin on Dry Matter Intake, Milk Production, Apparent Total Tract Digestibility, and Faecal Bacterial Community in Multiparous Holstein Dairy Cow during the Postpartum Period

被引:9
作者
Gaowa, Naren [1 ]
Zhang, Xiaoming [1 ]
Li, Huanxu [2 ]
Wang, Yajing [1 ]
Zhang, Jun [3 ]
Hao, Yangyi [1 ]
Cao, Zhijun [1 ]
Li, Shengli [1 ]
机构
[1] China Agr Univ, Beijing Engn Technol Res Ctr Raw Milk Qual & Safe, Coll Anim Sci & Technol, State Key Lab Anim Nutr, Beijing 100193, Peoples R China
[2] Beijing Oriental Kingherd Biotechnol Co, Beijing 100069, Peoples R China
[3] Northwest A&F Univ, Coll Anim Sci & Technol, Yangling 712100, Shaanxi, Peoples R China
来源
ANIMALS | 2021年 / 11卷 / 03期
关键词
rumen-protected niacin; dry matter intake; milk production; multiparous Holstein dairy cow; postpartum period;
D O I
10.3390/ani11030617
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
Simple Summary The main challenge faced by cows during the first three weeks after calving is the sudden increase in nutrient demand for milk production while dry matter intake and nutrient supply lag. Although metabolic hormone changes are a normal adaptive process in high yielding cows, failure to adapt to this challenge can lead to disease states and affect production and reproductive efficiency. Therefore, a smooth transition from prepartum to postpartum period for optimal dairy cow health and performance. Whether rumen-protected niacin supplementation could be a useful additive was controversial. This work tested whether the widespread use of rumen-protected niacin in multiparous Holstein dairy cows could be justified. Extensive studies about rumen-protected niacin (RPN) supplementation on dairy cows in early-lactation have been done, but the effects of RPN on changes in dry matter intake (DMI), milk production, feed digestibility, and fecal bacterial community were conflicting. The aim of this study was to investigate them affected by RPN in postpartum cows. Multiparous Holstein dairy cows (n = 12, parity = 3.5 +/- 0.5, body weights = 740 +/- 28 kg) were divided into two groups supplemented with either 0 (CON) or 20 g/d RPN (RPN). Our results showed that RPN supplementation increased DMI and milk production of cows during the first three weeks after calving (p < 0.05). The concentrations of neuropeptide Y and orexin A were significantly higher in RPN group than that in the CON group during postpartum period (p < 0.05). The apparent total-tract digestibility of nutrients was similar between the CON and RPN groups at 2 weeks after calving (p > 0.05). The 16S rRNA gene sequencing analysis showed that RPN had no impact on the alpha and beta diversity, although 4 genera were changed in cow feces at 14 days after calving. Overall, 20 g/d RPN added to the diet could improve DMI and milk yield up to two weeks after calving with little influence on feed digestibility.
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页码:1 / 12
页数:12
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