The effect of coated choline used in the transitional period in dairy cows on reproduction, milk production and some metabolic diseases

Dairy cattle have been genetically selected to achieve greater milk holding since the last 50-60 years and milk yields have been demonstrated by applying better rules of care. With the genetic progress achieved, the results of the milk-parental transitions (fat rises, ketosis, milk fever, mammary edema, retention, abomasum displacement, acidosis, laminitis) problems arose during the transition period. In these cows, the effects of metabolic disease and first insemination success will be examined after the use of coated choline for a period of 3 weeks before birth and 3 weeks after birth, which is called the transition period. The purpose of the experiment is to use Holstein dairy cattle that will give birth to 100 units. These animals will be divided into 2 groups. Both groups will be given the same ration, only the experimental group will be targeted at 60 g/animal coated choline. The trial will last 42 days. In the trial, blood tests will be done when the last 21 days are over and the early period starts. The results of these blood tests will be examined whether it will work without keto. 75-81 days after birth. The first insemination will be carried out between days. 28-32 days after insemination, birth control will be done with the use of ultrasound and the first insemination success will be calculated. In the experimental groups where 60 g/day/head encapsulated choline was used during the transition period, an increase of 784.7 kg/day/head in 305-day milk yield and an increase of 1.35 kg/day/head in peak milk yield were calculated. In terms of reproductive performance, a 4% decrease in the success of first insemination was observed. When examining the effect of encapsulated choline usage during the transition period on metabolic diseases, a 4% decrease was calculated in Ketosis+1 (1.2-2.4 mmol/L), Ketosis+2 (>2.4 mmol/L), and abomasum displacement. Additionally, no difference was observed in hypocalcemia in the groups where choline was used. When the data on septic metritis were examined, a 16% decrease was calculated in the experimental groups, which was found to be statistically significant.