Manganese is an essential microelement. Manganese deficiency affects reproduction performance and reproductive hormones in layers. However, little is known about its effects and the possible mechanism in regulating reproduction in broiler breeder hens. In the current study, broiler breeder hens at peak production were fed with diets supplemented with 0, 120, or 240 mg of Mn/kg as MnSO4 or Mn pr...

An experiment was conducted to assess how hatching performance is affected by breeder age and egg holding environment during short-term storage. Response variables analyzed were egg weight loss up to 18 d of incubation, viability (hatchability of fertile eggs), embryonic mortality, hatching time, and weight of male and female chicks, at hatching and at the end of incubation. The trials involved...

Sources of Zn, Mn, and Cu (IZMC) as sulfates or as amino acid complexes (OZMC) were used to supplement Cobb 500 breeder hen diets. Experimental treatments consisted of diets supplemented with 1) 100, 100, and 10 mg/kg of Zn, Mn, and Cu, respectively, from IZMC (control); 2) 60, 60, and 3 mg/kg of Zn, Mn, and Cu, respectively, from IZMC plus 40, 40, and 7 mg/kg of Zn, Mn, and Cu, respectively, f...

Title of Document: INVESTIGATION OF CHICKEN EMBYO METABOLISM AND SUBSTRATE UTILIZATION DURING LATER DEVELOPMENT Qiong Hu, Doctor of Philosophy, 2013 Directed By: Associate Professor, Brian J. Bequette, Department of Animal and Avian Sciences The objective of this research was to determine metabolic adaptations and substrate utilization during chicken embryo development and to determine the infl...

INTRODUCTION Tumours in commercial poultry are mostly caused by infection with avian herpes, leukosis and retroviruses and thus most studies on avian tumours have been focused on those with viral aetiology, probably due to their economic importance and also because they serve as a model for human cancer studies. Adenocarcinomas in poultry are among the groups of tumours of unknown aetiology, an...

Avian sperm are stored in the sperm storage tubules (SSTs) of the hen oviduct for a prolonged period. The impact of avidin-related protein-2 (AVRP2) and carbonic anhydrase II (CA II) in sperm viability in the SSTs has been suggested. The aim of the present study was to investigate the effect of oral administration of a high dose of thyroxine on the oviductal expression of AVRP2<...

Nutrition supplementation in broiler breeder diets are necessary to provide the nutritional requirements for optimal performance of flock after significant genetic improvement production performance. The study aimed determine effect adding vitamin E and organic selenium diet Rose 308 productive reproductive traits. experimental consist 60 hens 10 cocks at 41 weeks age. birds divided into four g...