Antanaitis R, Juozaitienė V, Televičius M, Malašauskienė D
Large Animal Clinic, Veterinary Academy, Lithuanian University of Health Sciences, Tilžės 18, Kaunas, Lithuania.
Department of Animal Breeding and Nutrition, Veterinary Academy, Lithuanian University of Health Sciences, Tilžės 18, Kaunas, Lithuania.
Pol J Vet Sci. 2018 Dec;21(4):763-768. doi: 10.24425/pjvs.2018.125589.
This study investigated changes in the real-time measured levels of milk β-hydroxybutyrate according milk yield, lactation number and status of reproduction in dairy cows. A total of 378 cows were selected. According to their reproductive status the cows were classified as belonging to the following groups: Fresh (1 - 44 days after calving. n=43). Open (45 - 65 days after calving. n=78), Inseminated (1 - 35 days after insemination. n=133). Pregnant (35 - 60 days after insemination and pregnant (relatively pregnant) (n=124). The cows were milked with DeLaval milking robot (DeLaval Inc., Tumba, Sweden) in combination with a Herd Navigator (Lattec I/S. Hillerød. Denmark) analyser. We observed that milk β-hydroxybutyrate (BHB) had a tendency of increasing with an increase of lactation number. The average BHB in multiparous cows was 11.111% higher in com- parison with primiparous cows (p⟨0.001). We found higher BHB concentration in the multipa- rous cows in all reproduction status groups (p⟨0.001). A strong positive statistically significant (p⟨0.001) relationship has been found between BHB and the average milk yield within all groups of primiparous cows although we found a statistically unreliable coefficient of correlation (from -0.202 to 0.057) between highest milk yield and BHB in primiparous and multiparous cows.
本研究调查了奶牛的产奶量、泌乳次数和繁殖状态对实时测定的乳中β-羟基丁酸水平的影响。共选取了378头奶牛。根据其繁殖状态，奶牛被分为以下几组：产后新鲜期（产犊后1 - 44天，n = 43）、空怀期（产犊后45 - 65天，n = 78）、输精后（输精后1 - 35天，n = 133）、怀孕期（输精后35 - 60天且已怀孕（相对怀孕），n = 124）。使用利拉伐挤奶机器人（瑞典通巴的利拉伐公司）结合牛群导航仪（丹麦希勒勒的Lattec I/S公司）分析仪对奶牛进行挤奶。我们观察到，乳中β-羟基丁酸（BHB）有随泌乳次数增加而升高的趋势。经产奶牛的平均BHB比初产奶牛高11.111%（p < 0.001）。我们发现在所有繁殖状态组中，经产奶牛的BHB浓度都更高（p < 0.001）。在所有初产奶牛组中，BHB与平均产奶量之间存在统计学上极显著的正相关关系（p < 0.001），尽管我们发现初产和经产奶牛的最高产奶量与BHB之间的相关系数在统计学上不可靠（从 -0.202至0.057）。
