Mohammed Haroun*⁽¹⁾ Mohsen Hmeshe⁽¹⁾ Zouhair Jabbour⁽¹⁾and Tamara Al-Jallad⁽²⁾

(1) . Animal Production Department, Faculty of Agriculture, Tishreen University, Lattakia, Syria

(2) . Center of Scientific Agricultural Research, Department of Livestock, Lattakia, Syria

(*Corresponding author: Mohammed Haroun. E-Mail: m7haroun@gmail.com).

Received: 6/10/2023                Accepted: 24/12/2023

Abstract: 

This research was conducted in 2022, in both its productive and molecular parts, the blood samples was taken from 70 laying hens of the Bovans White global hybrid layer and were subjected to DNA analysis, three genetic loci associated with egg production trait were studied (APH-09, APH-24, ADL-209). The egg-laying curve was studied for a period of 73 days, and the performance of the hybrid chickens was evaluated in terms of productivity. Eggs were weighed on a daily basis and for each individual separately in order to calculate the average weekly egg weight. The age of sexual maturity for the individual and for the flock separately was recorded. The number of eggs produced reached 73 Eggs in 13 individuals at the age of 31 weeks. The percentage of egg productivity reached 99.48% in the month of peak production, and the weekly average egg weight reached 54.28 grams in the 31st week of the birds’ life. The age of sexual maturity of the individual was recorded ranging from the age of 121 days at its minimum to 150 At its maximum, the age of sexual maturity of the flock was recorded at 145 days. the percentage of flock productivity reached 50% on two consecutive days. The molecular results showed the variation of individuals in the studied hybrid flock in terms of the absence or presence of alleles and in the total number of alleles found in each of them. The total number of alleles obtained on the three genetic loci was (18) alleles with an average of 5.666 alleles/one loci, while the genetic diversity values reached 0.248, 0.104, and 0.184 in the studied loci APH-09, APH-24, and ADL-209, respectively With an average of (0.178), this genetic diversity is a natural result in the Bovans White hybrid flock. The 18 chickens that showed alleles of the genetic loci studied were characterized by high productivity ranging from (0.84-1).

Keywords: Bovans White, Egg number, Egg weight, Age at first egg, SSR-PCR

Full Paper in Arabic: pdf