Comparative Efficiency of Selection Indices on a White Leghorn Population
نویسندگان
چکیده
منابع مشابه
Study of Oviposition Pattern and Clutch Traits in a White Leghorn (WL) Layer Population
Various layer traits were recorded on 1082 pullets at 29 generation of selection to evaluate the variability for egg production. Oviposition time of each egg was recorded at hourly and half an hour intervals under 16L: 8D cycle, up to 40 weeks of age and for 15 days period respectively, to study the distribution pattern of oviposition time. Early (06-11h) and late (11-17 h) pattern of ovipositi...
متن کاملGroup size and density effects on physical indices and cell-mediated immunity in two genetic lines of white leghorn layers.
Social stress resulting from varied group sizes with density in caging systems is a common problem that affects bird welfare in the poultry industry in the United States. To examine whether there is a genetic basis for variations in response to group size and density, 2 genetic strains of White Leghorn hens were used in this study: HGPS, a line selected for high group productivity and survivabi...
متن کاملHistomorphological Observations on the Parathyroid Glands in White Leghorn Birds
Parathyroid glands from laying hens were also xed in percent glutaraldehyde in phosphate buffer (0.1 M, 7.3 pH) for araldite embedding and used for electron microscopy. For routine histological observations, sections of 5 to 6 um thickness were cut and stained by, Mayer’s haemalum and eosin-phloxine, Masson’s trichrome, Crossman’s modi cation of Mallory’s triple stain, van Gieson’s method fo...
متن کاملComparative effects of furnished and battery cages on egg production and physiological parameters in White Leghorn hens.
Laboratory animal well-being can be improved by housing the animals in species-specific natural or near-to-natural environments. An enriched environment may have a similar effect on chickens. The purpose of this study was to examine if housing environment (furnished cages vs. battery cages) effects the well-being of laying hens. One hundred ninety-two 1-d-old non-beak-trimmed White Leghorn W-36...
متن کاملtransference of imagery: a comparative formalistic study of shakespeares hamlet and its two persian translations
هدف از این تحقیق بررسی انتقال صور خیال هملت در دو ترجمه ی فارسی آن از نظر فرمالیستی بود. برای بدست آوردن داده-های مورد نیاز، 130 نمونه استعاره، مجاز، ایهام، کنایه و پارادوکس در متن اصلی مشخص شده و سپس بر اساس مدل نیومارک (1998) برای ترجمه ی استعاره یا بطور کلی زبان مجاز با معادل های فارسی شان مقایسه گردیدند. این تحقیق بر آن بود تا روش های استفاده شده برای ترجمه هر کدام از انواع زبان مجاز ذکر شد...
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ژورنال
عنوان ژورنال: Poultry Science
سال: 1972
ISSN: 0032-5791
DOI: 10.3382/ps.0510294