This study was conducted to determine the effect of photoperiod and feeding time on oviposition time and eggshell quality of broiler breeders. Five experiments were conducted in total. The effect of photoperiod on oviposition time was tested in Experiments '1 and 2. Experiment 1 involved 3200 33-week old broiler breeder hens housed in floor pens and subjected to photoperiods of 10, 11, 12, 13, ...

Ornithobacterium rhinotracheale (ORT) has been identified as one of the respiratory bacterial pathogens in turkey and chicken flocks. Four live birds displaying severe torticollis were submitted from a 13-week-old commercial broiler breeder chicken flock located in Mazandaran province. These birds were suspected to pasteurellosis by the farm veterinarian. No other marked gross lesion except ema...

Chicken seminal plasma contains a high content of sex steroids including progesterone (P4). According to a published study, in vitro supplementation of P4 to the semen resulted in decreased fertility in the White Leghorn chicken; however, it is not known if increased P4 production in vivo is associated with decreased sperm fertility. Therefore, the aim of the present experiment was to study the...

Reports on the influence of dietary crude protein on male broiler breeder fertility are not consistent, and therefore an experiment was conducted to determine the effect of three isoenergetic diets containing 10.5%, 12.6% and 15% crude protein, respectively, on Ross broiler breeder male fertility from 26 to 41 weeks of age. Feed allocation was the same for each treatment, and was done according...

malformations which occur during the development of the avian body organs can lead to structural and functional abnormalities. most defects are recognized at hatching, but some go undetected until somewhat later. the cause of the majority of animal congenital malformations is unknown. a significant proportion of congenital malformations of unknown cause are likely to have an important genetic c...

ornithobacterium rhinotracheale (ort) has been identified as one of the respiratory bacterial pathogens in turkey and chicken flocks. four live birds displaying severe torticollis were submitted from a 13-week-old commercial broiler breeder chicken flock located in mazandaran province. these birds were suspected to pasteurellosis by the farm veterinarian. no other marked gross lesion except em...

spondylitis is a reemerging epidemic spinal infection in male broiler chickens (5 to 7 weeks of age) as well as broiler breeder roosters (15 to 18 weeks of age). among various causative agents, enterococcus species and in particular e. cecorum, a gram-positive bacterium as a gastrointestinal flora of birds, have mostly been isolated. on late september 2015, a number of 10 weeks old roosters wit...

The modern broiler and breeder are performing at levels never seen before. In order to multiply by 15x (or more) their bodyweight in just four weeks, they do not have the time to correct the effects of nutritional deficiencies. In a recently published paper coming from the University of Alberta, the effect of genetic selection was studied using unselected strains from 1957, 1978 and a 2005 comm...

The aim of the present work is to make a review on the literature concerning the incidence of some major pathologies of leg skeleton in broiler chickens and broiler breeders, related to poor animal welfare. On the basis of data on the incidence of leg skeletal pathology published by us and by other researchers, this review goes through some reports on femoral head necrosis (FHN), tibial dyschon...