Effect of Adding Choline Chloride to the Diet in Milk Production of Holstein Cows

Abstract

This study aimed to show the effect of adding choline chloride to the feed on milk production during the summer in central Iraq. This study was conducted at Al-Khalis cows station in Diyala Governorate during the period from 21/6 to 21/9/2022, where 25 Holstein cows between the ages of 3-5 years used, the cows were divided into five treatments, so that treatment T1 represents the control treatment (without adding Choline chloride), while treatments T2 and T3 add untreated and formaldehyde-treated choline chloride, respectively, to the concentrated feed with an amount of 35 g /cow /day, T4 and T5 add untreated and formaldehyde-treated Choline chloride, respectively, with an amount of 70 g /cow /day, It is noted from the results that there is a significant effect of the treatment of adding Choline chloride treated with formaldehyde T3 during the ninth and thirteenth weeks in the daily milk. In the ninth week, the average milk production was 14.50 kg / cow/day compared to 9.88 kg/cow/day in the control treatment, and the rest of the treatments were T4 and T5 were 11.25 and 10.00 kg/cow/ day respectively. In the thirteenth week milk yield was 12.50 kg/cow/day compared to 7.20 kg/cow/day in the comparison treatment, and the rest of the treatments T2, T4, and T5 were 8.75, 8.50, and 8.60 kg/cow/day, respectively. While the monthly and total milk production and the amount of fat and protein in milk for cows, there were no significant differences between the treatments, we conclude from the current experiment that adding Choline chloride treated with formaldehyde in an amount of 35 g / cow/day to the feed increases the daily milk production in some weeks for this experiment in the season Summer when the average Temperature Humidity Index for this season is 79 and cows are under heat stress.