background: improvement of hatchability in aging broilerbreeder has economic justification. objectives: the main objective ofthis study was to determine the effect of dietary anethum graveolensessential oil on egg quality, some plasma metabolites and hatchability inbroiler breeder hens. methods: a total number of eighty hens and eightcocks from ross 308 strain of 105 weeks old were divided into...

s of papers 47 and a mid-production period (12-16 wks of production). The SP hole distribution indicated that 85% of hens had between 21 and 100 holes. Depending on the sire, the data exhibited differences due to hen or hen by period interactions. These results indicated that eggs from hens inseminated with semen from the same sire had significantly different numbers of IPVL SP holes. This sugg...

The study was carried out to assess the reproductive abilities of White Plymouth Rock (WPR) and Barred Plymouth Rock (BPR) parent stock (layer breeders) reared under similar housing (deep litter), management and agro-climatic conditions. A total of 1,763,322 and 1,732,966 fertilized eggs were produced by WPR and BPR, respectively, during the observed period which lasted four years (2002-2005). ...

The present study examined the effects of tributyltin (TBT), polychlorinated biphenyls (PCBs), and mixtures of both chemicals on reproduction in Japanese medaka, Oryzias latipes. For 21 d we gave groups of medaka freeze-dried brine shrimp flakes contaminated with a mixture of either 0, 1, 5, or 25 microg TBT g(-1) plus 0 or 25 .micro PCBs g(-1). We measured the fecundity and fertility of the pa...

The experiment was carried out in poultry experimental station belonging to NRC, Cairo, Egypt. A total of 120 Fayoumi layers, 45 weeks old, were randomly divided into four equal groups. Each group included three replicates (10 hens in each). The first group was fed the control diet containing 3.3% gram Ca, whereas, the other three received diets containing 2.8, 2.6 and 2.4% gram Ca, respectivel...

A literature review on chicken blood groups provides ample evidence in support of an association between red cell antigens of chickens and performance traits of economic importance such as egg production, hatchability, weight of chicks at 9 to 10 weeks, and liveability of progeny, (see reviews by GILMOUR [1960] and BRILES [1964]). This evidence indicates a selective advantage of heterozygosis f...

This study was conducted in two steps to determine the effects of in ovo injection of zinc acetate (ZAC) on some gene expression associated with embryonic growth and development, and with growth and carcass characteristics of the resultant chicks. In the first step the effect of in ovo injectionofZAC on the expression of insulin-like growth factors (IGFs:IGF-I and IGF-I), myog...