Heterosis, Breed Maternal and Breed Direct Effects in Red Poll and Hereford Cattle2,3

Tarentaise and Hereford breed effects on cow and calf traits and estimates of individual heterosis.

Preweaning and weaning records on 457 calves and weights and milk production of their dams were used to evaluate breed of dam effects, breed of sire effects, and individual heterosis effects. Hereford and Tarentaise dams were mated to Hereford and Tarentaise sires and calves were born from 1987 to 1991. Calf traits were birth weight, proportion calving difficulty, weaning weight, weaning height...

Calculation of breed direct and maternal genetic fractions and breed specific direct and maternal heterozygosity for crossbreeding data

Teaching, research, and herd breeding applications may require calculation of breed additive contributions for direct and maternal Brazilian Journal of Genetics Calculation of breed direct and maternal ... http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-845519... 2 of 14 5/2/2008 1:54 PM genetic effects and fractions of heterozygosity associated with breed specific direct and mater...

Breed and heterosis effects of American Zebu cattle.

The Brahman (American Zebu) has been evaluated in numerous crossbreeding studies throughout the Southern United States. Brahman females producing straightbred calves have usually been found to have a lower calving percentage, calf survival rate and weaning rate than other contemporary straightbreds, although they have been reported to be superior or competitive in some studies. Birth weights of...

Maternal heterosis and grandmaternal effects in beef cattle: postweaning growth and carcass traits.

Crossbred steer and heifer progeny from 5-, 6- and 7-yr-old dams produced in a four-breed diallel crossing experiment involving the Brown Swiss, Red Poll, Hereford and Angus maternal grandsires and maternal granddams were evaluated for postweaning growth and carcass traits to estimate breed mean maternal heterosis, maternal heterosis for specific breed cross females, average maternal heterosis ...

Breed and Heterosis Utilization in Rotational and Composite Crosses