Mahmoud Ibrahim Al-Mohamed ^(1)*

(1). Animal Production, Faculty of Agricultural Engineering, University of Aleppo, Aleppo, Syria.

(*Corresponding author: Dr. Mahmoud Ibrahim Al-Mohamed. E-Mail:

Mahmoud.lb.Almohamed@gmail.com)

Received  29/05 /2024                 Accepted  29/ 07/2024

Abstract

the research was conducted at the Jeb Ramla cattle station on 82 Holstein Friesian cows, during the period from the beginning of 2022 to the beginning of 2024, with the aim of studying the effect of the length of the Dry Period Length on the amount of total milk production, the average of 305 days, daily milk production, and production during the first and second stages of lactation, aside from to the effect on the length of lactation, the Lactation curve for milk, and the continuity of production during subsequent lactation . Cows were classified according to dry periods into three categories, which were less than 45, 45-55, and more than 55 days. The data was analyzed using SPSS26 software. The results showed a highly significant effect of the length of the dry period on all milk production indicators studied. The Lactation curve was also affected by the Dry Period Length. Shortening the Dry Period Length led to a decrease in milk production quantities and continuity of production. Cows with a short dry period of less than 45 days reached peak production early, compared to cows with a period of 45-55 days that continued longer to maintain high production in subsequent lactation.

Key words: Dry Period, milk production, the Lactation curve for milk, cows.
 Full paper in Arabic: PDF