نتایج جستجو برای: 23 days of age

تعداد نتایج: 21224288  

Journal: :Revista Brasileira de Ciências Agrárias - Brazilian Journal of Agricultural Sciences 2014

Journal: :پژوهش های علوم دامی ایران 0
مهدی ناقوس عباس پاکدل رسول واعظ ترشیزی

in order to investigate the growth curve of broiler chickens at line level, respectively 154 and 144 birds from two paternal lines a and b of a commercial broiler line were used. line a were selected several generations for low feed conversion rate and line b were selected several generation for high body weight. body weight was measured at 1, 4, 7, 10, 14, 17, 21, 28, 35, 42, 49 and 54 days of...

Journal: :The Japanese Journal of Gastroenterological Surgery 2000

ابوالقاسم گلیان, , فریدون افتخار شاهرودی, , مهدی نصیری محلاتی, , حسن کرمانشاهی, , شهریار مقصودلو, ,

An experiment with a 33 factorial arrangement in a completely randomized design with 450 day-old broilers was conducted to study the effect of energy level and time of change from starter to finisher diets on performance and economic aspects of broilers. Broiler chickens were fed at three levels of dietary energy (2800, 3000, and 3200 KcalME/Kg) from 1-42 days of age. Starter and finisher diet...

Journal: :Investigative ophthalmology & visual science 1999
M Frasson S Picaud T Léveillard M Simonutti S Mohand-Said H Dreyfus D Hicks J Sabel

PURPOSE To evaluate the neuroprotective potential of glial cell line-derived neurotrophic factor (GDNF) in the retinal degeneration (rd/rd) mouse model of human retinitis pigmentosa. METHODS Subretinal injections of GDNF were made into rd/rd mice at 13 and 17 days of age and electroretinograms (ERGs) recorded at 22 days. Control mice received saline vehicle injections or underwent no procedur...

2013
Jessica S. Cooke Zhangrui Cheng Nicola E. Bourne D. Claire Wathes

Age at first calving (AFC) affects the profitability of dairy enterprises. This study examined the relationships between AFC and subsequent fertility, milk production and survival up to third calving in UK Holstein-Friesian heifers; Study 1 comprised 134 consecutively born heifers from the same herd (AFC 764 ± 8 days) and Study 2 contained 445 heifers born on 17 farms (AFC 796 ± 6 days). Growth...

O.R. Madibela, W. Mahabile

Retrospective data from Sebele Dairy Farm were analysed for reproductive performance of Friesian/Holstein cows. Three hundred records from 1989 to 1995 were used. The herd was zero grazed and the data was analysed for age at first calving (AFC), calf birth weights (BW), calving interval (CI), days open (DO), calving rate (CR), reproductive wastage (RW) and calving difficulty (CD); dystocia, aft...

ژورنال: علوم آب و خاک 2003
ابوالقاسم گلیان, , فریدون افتخار شاهرودی, , مهدی نصیری محلاتی, , حسن کرمانشاهی, , شهریار مقصودلو, ,

An experiment with a 33 factorial arrangement in a completely randomized design with 450 day-old broilers was conducted to study the effect of energy level and time of change from starter to finisher diets on performance and economic aspects of broilers. Broiler chickens were fed at three levels of dietary energy (2800, 3000, and 3200 KcalME/Kg) from 1-42 days of age. Starter and finisher diet...

The aim of this study was to model the variances and covariances of body weight in Zandi sheep from 60 to 365 days of age using random regression models (RRM). Legendre polynomials of different orders were used to model the direct and maternal covariances. Mean trends were also modeled through a quadratic regression on orthogonal polynomials of age. Homogeneity and heterogeneity of the residual...

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