Smaa Dabdob* (1)
(1). Dept. of Animal Production, Faculty of Agriculture, Albaath University وHomas, Syria.
(*Corresponding author: Dr. Smaa Dabdob. E-Mail: smsmaanid@yahoo.com).
Received: 23/10/2020 Accepted: 25/11/2020
Abstract
The study was conducted at Al-Mukhtariya Station in Homs (Syria). Thirty nine Friesian cows during a time period of five months, and experimental animals were divided into four groups according to the production season (the first, third and fifth), and added a mixture of vitamins and minerals (premix) by different ratio of the concentrate feed mixture for all experimental groups (0, 0.25 , 0.50 , 1 g/ kg). The objective of this research is to study the effect of supplement different levels of a mixture of vitamins and minerals (premix) to experimental rations on milk composition (fat) in Friesian cows of different milking seasons. The results showed that there are no significant differences in a milk fat due to the premix used in the feeding mixture, meanwhile it does exist among the milk seasons. The results also showed that there were significant differences (P≤0.05) in milk fat according to the different productive season of the cow as the first season exceeded both the third and fifth season by the percentage of milk fat.
Keyword: premix, Friesian cows, fat milk.
Full paper in Arabic: PDF