Environmental conditions influence hatchability of ostrich eggs as these include the length of the storage period, temperature, humidity, gaseous environment, and orientation of the eggs (MELLET, 1993). There is a decrease in hatchability of the egg during storage (MEIJERHOF, 1992). A study in poultry (BUTLER, 1991) suggests that longer storage delays hatch time and reduces chick quality and gr...

A N I M A L breeders often select the extreme individuals in a population. This may conflict with natural selection for reproductive fitness. For example, chickens with intermediate body weights and egg weights usually have the highest hatchability. LATTER and ROBERTSON ( 1962) hypothesized that the decline in fitness with selection for a metric trait is a consequence of gene frequency changes ...

In this experiment, the influence of prebiotic and probiotic supplementation in the broiler breeder diets on body weight, mortality, feed intake, egg production, hatchability and humoral immunity response was investigated. A total number of 13140 female and 1260 male breeders (Cobb 500) with 26 wks of age were allocated to three treatments with six replicates (800 birds each replicate). Breeder...

BACKGROUND Florfenicol, a commonly used veterinary antibiotic, was reported to have caused a severe drop in egg hatchability following its off-label use on a broiler breeder farm in South Africa. According to the pharmacovigilance report, hatchability dropped by 80 % for up to a week following a five day course at 10 mg/kg (both males and females treated metaphylactically) to manage an Escheric...

Routine, upgrading, and intersecting cross-breeding strategies are three methods frequently used in poultry breeding. But, till now, comparative assessment of the effects on improvement geese economic traits with these is largely unknown. Here, using Carlos goose Zi goose, were employed compared. The main traits, including egg production capability, quality, growth performance, meat down feathe...

SUMMARYTukong is the rumpless indigenous chicken breed of Indonesia. Its features must be described as basis for their preservation and improvement. The current understanding Tukong, including its origin, exterior traits, production indicators, presented in this review. As a result, feather colour varies from greenish-black, reddish-black, bluish-black, brown, white, with red pea-shaped comb. T...