Genetic trends for weaning weight were evaluated in 15 purebred herds in the United States participating in the Angus Herd Improvement. Records production testing program. Regression techniques were used for separate estimates of sire and dam contributions that were summed to estimate total herd trend. Sire contributions, calculated as the pooled within sire regression of weaning weight ratio o...

sale calves. Other contributions to variation in revenue are from values of cull cows, replacement costs and dystocia costs. Discounting procedures are not included. In contrast to other models, the software provides for sire selection by simulation rather than simply generating economic values for subsequent use. Accordingly, the model needs to directly incorporate heterosis effects from multi...

Generalized mixed linear, threshold, and logistic sire models and Markov chain, Monte Carlo simulation procedures were used to estimate genetic parameters for calving rate and calf survival in a multibreed beef cattle population. Data were obtained from a 5-generation rotational crossbreeding study involving Angus, Brahman, Charolais, and Hereford (1969 to 1995). Gelbvieh and Simmental bulls si...

This study investigated whether the prenatal maternal environment in dairy cattle influences the postnatal milking performance of the resulting daughters and grand-daughters. Linear mixed models were used to analyse whole season milk production from ∼ 46,000 Jersey and ∼ 123,000 Holstein Friesian cows in their 1st and 2nd lactations. Variation in the prenatal environment was associated with a s...

OBJECTIVES The primary objective of this study is to study Maternal Mortality as per Gravidity among Tribal women at a tertiary level of care in Bastar, Chhattisgarh, India. MATERIALS AND METHODS This is a hospital based ,retrospective, reproductive-age mortality study (RAMOS) of tribal women of Bastar region, Chhattisgarh, that were admitted and managed in Obstetrics and Gynecology Departmen...

The objectives of this work were to evaluate birth and weaning traits, to estimate genetic effects, including heterosis and direct and maternal breed effects, and to evaluate calving difficulty, calf vigor at birth, and calf mortality of Romosinuano as purebreds and as crosses with Brahman and Angus. Calves (n = 1,348) were spring-born from 2002 through 2005 and weaned in the fall of each year ...

Records of a White Leghorn Line from three generations were used to evaluate the genetic parameters (heritabilities and breeding values) for production traits in laying hens based on individual and group mean records, taking into account mortality in the data structure. Three different data structures of group mean records, which were Hen Housed Production (HHP), Hen Housed Production corrected...

A crossbreeding experiment was conducted between the Sinai (SI), an indigenous Egyptian strain, and exotic Lohmann Brown (LB) breeds of chickens. total 790 chicks were produced in four genetic groups, namely SI x SI, LB LB, SI. The objective to estimate direct additive effect (gi), individual heterosis (hi), maternal (gm) for growth reproduction traits. Direct effects positive (P ≤0.01) bodywei...

Scottish Blackface lamb viability records at birth, and postnatal survival from 1 day to 14 days, from 15 days to 120 days and from 121 days to 180 days were used to determine influential factors and to estimate variance components of lamb survival traits. The binary trait viability at birth was analysed using a linear model whereas the postnatal survival traits were analysed as continuous trai...