Effect of Breed and Some Non - Genetic Factors on Milk Production and Some Proportions of Its Chemical Components in Two Breeds of Local Sheep

Rahman Hussein Al-Qasimi,Allawi L.D Al-Khauzai,Shatha Mohammed Abbas

doi:10.33794/qjas.2020.167070

Abstract

: The study was carried out on 19 ewes of local Awassi sheep and 12ewes local Arabi sheep in the Al-kafeel sheep station Karbala, to determine the effect of breed and some non-genetic factors such as (sex of the lamb, type of birth, age and weight of ewes at birth) on daily and total milk production and lactation period and some of milk components (fat, protein and lactose). The results showed that a significant effect (P <0.05) of the breed on milk production traits where Awassi sheep recorded the highest mean (0.91 kg , 101.63 kg , 104.86 day) compared to the Arabi sheep she was means (0.77 kg , 88.15 kg , 99.15 day) respectively. As well as in proportions of milk components with mean( 5.1 , 4.90 , 5.51) % respectively compared to the Arabi sheep (4.70 . 4.20 . 4.89) ewes with male lambs also exceeded superior ewes with female lambs in daily and total milk production and the lactation period the sex of the lamb did not affect the proportions of milk components the weight of the ewes had a significant effect (P <0.05) in milk production attributes with superior weight of ewes on lower ewes and did not affect the proportions of milk ingredients except for lactose. The type of birth and the age of the ewes did not have a significant effect in all the studied traits except for the superiority (P<0.05) of young ewes on age ewes in the fat percentage of milk.

Highlights

Milk production in sheep is an important economic rraits because the growth of lambs in the early stages of their lives depends mainly on the milk production of their ewes as well as the growing interest in sheep milk commercially, this is due to its nutritional importance and its use in the manufacture of cheeses and animal fats [1]
Ewes with male lambs outperformed ewes with female lambs in the daily milk production. fat percentage was not affected by the sex of the lamb in the [4] study on the hamdanid sheep breed. there are studies that indicate that the daily and total milk production and the lactation period increases with the age of ewes, where the ewes at the age of 5 years exceeded superior the ewes at the age of 4, 3, 2 years [5]
It is clear from Table (1) that the trait of milk production were significantly (P

Summary

Introduction

Milk production in sheep is an important economic rraits because the growth of lambs in the early stages of their lives depends mainly on the milk production of their ewes as well as the growing interest in sheep milk commercially, this is due to its nutritional importance and its use in the manufacture of cheeses and animal fats [1]. It was observed that the breed effect was highly significant in the daily and total milk production in a study conducted by [3]. There are studies that indicate that the daily and total milk production and the lactation period increases with the age of ewes, where the ewes at the age of 5 years exceeded superior the ewes at the age of 4, 3, 2 years [5]. The aim of this study was to investigate the effect of breed, sex of the lamb, type of the birth, age and weight of the ewes of two local sheep, awassi and arabi, in daily and total milk production and lactation period, as well as some milk components such as fat, protein and lacose

Objectives

Methods

Results