An experiment was conducted to assess how hatchability performance of eggs is affected by line and age female broiler breeders. Response variables analyzed were hatchability, infertility, pipping (i.e., pipped shell but not emerged), embryonic mortality (1st, 2nd, 3rd wk), malposition. The trials involved a total 2,880 fertile from two breeder lines (Ross 308 Cobb 500) at different ages (30 50 ...

Before any significant progress can be made in altering textural characteristics of a meat product, the basic profile of the meat and the possible alterations in that profile due to processing procedures must be known. A number of papers have been published addressing ways to optimize the textural characteristics of broiler breast meat. Changes in broiler processing procedures and processing ti...

Effects of maternal dietary polyunsaturated fatty acids (PUFA) on the spleen fatty acid composition and BSA-induced wing web swellings were investigated in broilers. One hundred twenty broiler breeder hens 26 wk of age were randomly assigned to diets containing mainly wheat, corn, soy meal, barley, oat and 5% (wt/wt) added sunflower oil, fish oil, or a mix of sunflower and fish oils (1:1). Afte...

With increasing disparity between broiler breeder target weights and broiler growth potential, maintenance energy requirements have become a larger proportion of total broiler breeder energy intake. Because energy is partitioned to growth and egg production at a lower priority than maintenance, accurate prediction of maintenance energy requirements is important for practical broiler breeder fee...

The continuous improvement of quality of animal products and the animals themselves is one of the responsibilities we share as geneticists. As increases in human populations increase worldwide, the pressure to increase production of foodstuffs becomes more and more intense. Most notably, we have focused a tremendous effort at improving production of domestic animals. Among the meat-animal speci...

The present study was executed to compare breeder performance parameters (feed intake, Age at 1st egg, egg weight, hen day & hen house production %, FCR /kg and/dozen eggs) in mass selected (MS), pedigree based selected (PS) and random bred controls (RBC), in three consecutive generations of Japanese quail. In generation1 (G1), 11000 quail chicks were randomly distributed into 22 sub-groups. Af...

In this research a 100 day long treatment period was considered to unmask the probable adverse effects of long-term induced hyperthyroidism on histomorphometrical attributes of the oviduct in broiler breeder hens. A total of seventy 47-week-old Cobb 500 breeder hens were randomly allotted to two treatment groups (5 replicates of 7 hens each). Thyroxine (T4) was orally administered to the hypert...

Nowadays, the poultry industry gives a lot of importance to costs management at all the steps of production. In broilers, the production of hatching eggs or Day-Old Chick (DOC) does not represent a high proportion of the overall cost of production per kg of bird slaughtered. Nevertheless, the performance of broiler breeder is looked with a lot of attention, and the number of saleable chicks per...

Experiments with broiler breeder hens were undertaken to determine effect of feeding time and environmental temperature on various production variables, body weight, and feed consumption. Two temperature treatments were used: low cyclic temperature (10 to 25 C), and high cyclic temperature (21 to 39 C). The three feeding treatments were: fed one daily meal either at 0700 h (Treatment 1) or 1800...