منابع مشابه
S83 Egg Shell Colour in Free Range Laying Hens
Loss of shell colour in brown-egg layers is a shell quality issue in Australia and is periodically associated with free range egg production. This study investigated the loss of shell colour that occurs in some flocks of free range laying hens. Hens laying pale-coloured egg shells on a commercial free range farm were transferred to cages in an experimental facility. Egg quality was measured imm...
متن کاملFeed Conversion and Feeding Behaviour in Laying Hens
T_e high proportion of feed costs in total operating expenses (1,2,6) indicates that the utilization of feed by the birds is closely related to the profitability of >oultry operations. The relationship between feed conversion (expressed as a ratio between weight units of feed consumed per weight unit of product) and profitability (defined as an increment .of total income over total costs) is es...
متن کاملExogenous estradiol improves shell strength in laying hens at the end of the laying period
BACKGROUND Cracked shells, due to age related reduction of shell quality, are a costly problem for the industry. Parallel to reduced shell quality the skeleton becomes brittle resulting in bone fractures. Calcium, a main prerequisite for both eggshell and bone, is regulated by estrogen in a complex manner. The effects of estrogen, given in a low continuous dose, were studied regarding factors i...
متن کاملEffect of Wet Feeding on Feed Conversion Efficiency in Laying Hens during Summer Season
The aim of this study was to investigate the effect of wet feeding on feed conversion efficiency in laying hens during summer season. The study was carried out on 192 pullets of eight weeks age (distributed to four groups). The feed offered to chicks consisted of starter diet up to 8 weeks of age and grower diet up to 20 weeks of age. From 20 weeks onwards, birds were provided with layer diet u...
متن کاملSome More Consequences of the Intermittent Feeding of Particulate Calcium to Laying Hens
The commercial laying hen has demonstrated appetites for energy, protein and calcium. Compounded layer diets are balanced with respect to energy as it is generally considered that the energy appetite of the bird is dominant. The current practice of feeding compounded diets has been shown to be inefficient where environmental or disease status alters the bird’s energy metabolism (Mastika, 1987; ...
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ژورنال
عنوان ژورنال: Poultry Science
سال: 1945
ISSN: 0032-5791
DOI: 10.3382/ps.0240053