نتایج جستجو برای: weaning weight and 6

تعداد نتایج: 16991708  

Journal: :Journal of animal science 1991
I Boujenane G E Bradford

Data from 364 ewes of Sardi (S), D'man (D), S x DS, DS x S, S x D, D x S (F1), F2, D x DS and DS x D breed groups mated to F1 rams were analyzed for fertility, number of lambs born alive, litter size at weaning, litter weight at weaning per ewe joined and mean lamb weight at 60 d. Each ewe was exposed in two seasons and had one or two lambings. Effects of breed group were significant for all tr...

Journal: :New Zealand Journal of Agricultural Research 1979

Journal: :Journal of animal science 2006
B J Renquist J W Oltjen R D Sainz C C Calvert

Pregnancy rate, calving interval, birth weight, weaning weight, and quarterly BCS were collected for 5 consecutive years on 454 fall-calving multiparous British crossbred cattle (3 to 10 yr of age) to evaluate associations of age with BCS and production parameters. Body weight and BCS were collected pre-calving, prebreeding, at weaning, and midway through the second trimester of pregnancy (Augu...

Journal: :Journal of animal science 2007
S E Speidel R M Enns D J Garrick

In good environments, cow intake is sufficient for their own growth and for milk production to support their calf. In poor environments, cows lose BW or may reduce milk supply to maintain themselves. Heritability for direct genetic and maternal components of weaning weight as well as the correlations between these components might be expected to vary according to these circumstances. The purpos...

2007
D. K. Aaron R. R. Frahm D. S. Buchanan

Four 50-cow, C-sire lines of Angus cattle were established as part of a long-term selection project. Performance data through yearling age were collected on 2,749 calves during the 16-yr period, 1964 to 1979. Lines were selected for individual weaning weight, (WWL), individual yearling weight (YWL) and a combination of individual and progeny weaning weights (PTL). The fourth line was maintained...

D.R. Notter M.A.M.Y. Khandoker M.M. Mia, M.O. Faruque S.S. Husain

The objective of this study was to evaluate genetic and phenotypic parameters for some reproductive traits of Black Bengal does. Genetic parameters were estimated by Residual Maximum Likelihood procedure, fitting an animal model ignoring maternal genetic or permanent environmental effects. The least-squares means of litter size at birth (LSB), litter size at weaning (LSW), litter weight at birt...

Journal: :Genetics and molecular research : GMR 2010
X F De la Rosa Reyna H M Montoya V V Castrellón A M S Rincón M P Bracamonte W A Vera

The IGF1 gene (insulin-like growth factor 1) is a candidate gene for marker-assisted selection strategies. A single nucleotide polymorphism in the promoter region (IGF1/SnaBI) has been reported to be associated with production traits in several cattle breeds. Here, we report its allelic frequencies in Charolais and Beefmaster breeds; we confirm its association with three growth traits: weaning ...

2010
Bandana Sen Kaushik Bose Dilip Mahalanabis

Aim of the study was to explore the lean body mass (LBM%) and fat mass (FM%) percent of weaning age children from among the urban poor in Kolkata, India. We used a cross sectional study design. A convenience sample of apparently healthy infants aged 6 month to 24 month were evaluated for LBM% derived by an anthropometry based and a Bioelectrical Impedance analysis (BIA) based equations, validat...

1992
Brent Woodward

Understanding and using EPDs continues to be a popular topic among cattle producers because of their effectiveness when properly used in genetic selection. Use of EPDs, as with many other standard management tools, is not required to survive in the beef cattle business, but those who do will excel in terms of genetic improvement. With so many traits to monitor in a cow herd, producers should no...

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