Layer performance of four strains of Leghorn pullets subjected to various rearing programs
نویسندگان
چکیده
منابع مشابه
Early access to perches in caged White Leghorn pullets.
Osteoporosis, a progressive decrease in mineralized structural bone, causes 20 to 35% of all mortalities in caged White Leghorn hens. Previous research has focused on manipulating the egg laying environment to improve skeletal health, with little research on the pullet. The objective of the current study was to determine the effect of perch access on pullet health, bone mineralization, muscle d...
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Education and Production
Two experiments were conducted using four strains of Leghorn pullets, namely Babcock, DeKalb, H & N, and Shaver. Pullets were grown on conventional or low protein diets fortified with additional amino acids. At 18 wk of age, 64 pullets from each strain and diet treatment were transferred to individual laying cages, using eight replicate groups of four adjacently caged birds. In a second experim...
متن کاملEffects of perch access and age on physiological measures of stress in caged White Leghorn pullets.
The neuroendocrine system controls animals' adaptability to their environments by releasing psychotropic compounds such as catecholamines [epinephrine (EP), norepinephrine (NE), and dopamine (DA)], corticosterone (CORT), and serotonin (5-hydroxytryptamine or 5-HT). Changes of these neuroendocrine compounds have been used as biomarkers of animals' stress responses associated with their well-bein...
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ژورنال
عنوان ژورنال: Poultry Science
سال: 1997
ISSN: 0032-5791
DOI: 10.1093/ps/76.1.1