Relevance . Poultry farming is one of the promising sectors agriculture. High growth rate and good meat quality are main factors in breeding. A convenient tool for studying phenotypic characteristics breeds crosses, as well genetic new breeding forms, creation model animal populations. Methods The aim this study was to obtain first-generation crossbreeds from crossing egg meat-egg chicken breed...

The costs of egg production and incubation may have a crucial effect on avian reproductive decisions, such as clutch size and the timing of reproduction. We carried out a brood-size enlargement experiment on the great tit (Parus major), in which the birds had to lay and incubate extra eggs (full costs), only incubate extra eggs (free eggs) or did not pay any extra cost (free chicks) in obtainin...

Submitted: Jan 2, 2013; Accepted: Feb 6, 2013; Published: Aug 18, 2013 Abstract: This study was undertaken to determine the effects of divergent selection and different positions of Japanese quail eggs in artificial incubation on hatchability, egg weight loss, chick weight. 300 Japanese quail (100 birds in each line) were used for egg collection. These lines have been selected for high (HW) and...

Alizarin red S from 200 to 5000 mg L was used to mark the otoliths of whitefish embryos Coregonus lavaretus (L.) from 5 days after fertilization until shortly before hatching, to develop a method for evaluating the effect of stocking whitefish. Mark quality depended on developmental stage at the time of immersion. The best results were obtained when the otolith primordia had formed and had star...

Z. Brand, S.W.P. Cloete, C.R. Brown and I.A. Malecki 1 Department of Animal Sciences, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa 2 Institute for Animal Production: Oudtshoorn, PO Box 313, Oudtshoorn 6620, South Africa 3 Institute for Animal Production: Elsenburg, Private Bag X1, Elsenburg 7607, South Africa 4 Institute of Science & the Environment, University of Wo...

Poultry production at all scales of operation is wholly dependent on the supply of day-old chicks. Fertility and hatchability are two major parameters that highly influence the supply of day-old chicks. Fertility refers to the percentage of incubated eggs that are fertile while hatchability is the percentage of fertile eggs that hatch. It is therefore important to understand the factors that in...

Previous techniques that have been used to monitor broiler embryonic temperature and metabolism during incubation either have been invasive to the embryo or have not directly determined internal egg temperature. Therefore, the current investigation was conducted to determine the earliest day of incubation on which temperature transponder implantation in the egg air cell could be performed with ...

This study aimed to characterize production and reproduction performances in Rhode Island Red-White strain chicken developed and maintained at the Central Avian Research Institute, Izatnagar. Three hundred and forty six fertile eggs were set in automated electric incubation and 234 chicks were investigated in three hatches. The performance data was analyzed by least squares analysis of variance...