Sumaia dabdoub^(1)*

(1). Al-Baath University, Homs, Syria.

(*Corresponding author:  Dr. sumaia dabdoub, E-Mail   smsmaanid@yahoo.com)

Received 24/1/2023          Accepted:23/2/2023

Abstract: 

The study was conducted at Al-Mukhtariya Station in Homs.  Thirty Friesian cows during a time period of six months in 2021, and experiment animals were divided into four groups according to the production season (the first, third and fifth), and added mixture of vitamins and minerals (premix) by different ratio   to the  concentrate feed mixture three all experimental groups ( 0.25 , 0.50 , 1 g/ kg ) . The objective of this research is to study the effect of supplementing different levels of mixture of vitamins and minerals (premix) on the Quantity of milk in Friesian cows of different milking seasons. The results showed that the third season is more productive compared to the second and fifth seasons, on the other hand there is a significant increase in production with 0.5 compared to 0.25 and 1 concentration. The results also revealed that the common effect of the season and concentration was remarkable in the third season with 0.25 and 1 g/kg premix.

Key words:  premix, Friesian cows, quantity of milk.

Full paper in Arabic: pdf