Ovarian Morphology and Egg Quality Traits of Egyptian Selected Strain for Egg Production Compared with Commercial Laying Strains

Abstract

An experiment was conducted to evaluate the effect of selection for egg production performance of Cairo L-2 strain, as a local layer strain, after five generations of selection on productivity, ovarian morphology and some egg quality traits versus commercial Lohmann Brown-Lite (LBL) strain. The performance in the 5th generation was evaluated in Cairo L-2 and LBL strains for live body weight at sexual maturity (BWSM), age at sexual maturity (ASM), first egg weight (FEW), ovarian morphology, ovarian follicles number, ovarian weights and diameter, oviduct weight, liver weight, and stroma weight and their percentages to live body weight at sexual maturity for Cairo L-2 and LBL strains. Egg traits at 36 weeks of age including: egg number (EN), egg weight (EW), shell thickness (ST), and shell index (SI) were also obtained. Current results indicated that Cairo L-2 strain had higher ASM compared with LBL strain. Also, Cairo L-2 strain had lower BWSM, oviduct, ovary, stroma, and liver absolute weights and relative ovary weight compared with LBL strain. Ovarian follicles number, weights and diameter, FEW, and EN until 36 weeks of age were higher in LBL than in Cairo L-2 strain. Also, SI of the LBL was higher than that of Cairo L-2 strain. Moreover, Cairo L-2 strain egg production until 36 weeks of age was about 80% of that of LBL strain with good ST and SI. In conclusion, there were positive responses in ovarian morphology, egg production, and egg quality traits of Cairo L-2 strain associated with breeding program.

Increasing Heat Tolerance in Broiler by Using Thermal Manipulation During Embryonic Development

“…There has been a great increase in the demand, during the past years, for poultry production including meat and egg production associated with its low cost, good nutritional profile and suitability for further processing. This growing demand in poultry products has led to progressive increases in genetic selection not only for producing fast-growing birds [1,2] and increase egg production from egg type chicken [3] but also to use of poultry and chick embryos in medical research and pharmaceutical industry [4]. Therefore, it is necessary to know the environmental factors that affect poultry production efficiency and growth performance.…”

The Impact of Layer Strains Genotype on Egg Quality and Eggshell Ultrastructural

“…Egg quality includes various external and internal traits such as egg weight, length, width, shell weight, shell thickness, albumen weight, height, Haugh unit, and yolk weight. External qualities, such as shell weight and thickness, play a considerable role in the quality of eggs and the reproductive of chickens [7,8]. Additionally, shell quality is also important for ensuring the safety and longevity of the egg during storage and transportation.…”

“…Egg weight increases with the age of the hen throughout the egg production cycle [8,15]. The reproductive endocrine system of hens is influenced by factors like daylight length and climate temperature, which affect the productivity characteristics and quality of eggs [16].…”

Time of sexual maturity and early egg quality of Japanese quails affected by in ovo injection of medicinal plants

“…IO on different sites of the egg has been carried out routinely by many researchers (Maiorano et al, 2012) by some exogenous solutions, for example carbohydrates (Tako et al, 2004), proteins, amino acids (Ohta et al, 2001;Bhanja et al, 2005), vitamins (Al-Shammari, 2012), minerals, hormones, synbiotics or antibiotics. IO with aqueous PEs has two po-tential targets: firstly, as biological growth promoters, due to their contents of natural basic nutrients (proteins, carbohydrates, fat, vitamins, trace elements), which are regarded as primary ingredients of plants (Grashorn, 2010); secondly, as precautionary and antioxidant promoters, due to their biological EO (essential oil) contents and other bioactive components as plant secondary metabolites (Kabera et al, 2014).…”