Crosses of Three Exotic and Three British Breeds: Performance in Two Environments of Two-Year-Old Cows and Their Calves

Genetic differences among the predominant beef cattle breeds in Canada: An analysis of published results

“…Progeny of C, S and L breeds were compared for calving traits (Newman et (Rahnefeld et al 1988;Newman et al 1989), feed efficiency (McKay and Rahnefeld 1988) and carcass characteristics (Rahnefeld et al 1983) in this project. In addition, the nine F, crosses resulting from the contract matings and the H x A control cross were compared for 2-yr-old female performance (Lawson et al 1980), feed inputs (Fredeen et al 1987) and lifetime reproductive efficiency (Fredeen et al 1981). Three-way cross progeny resulting from matings of C, S, L and Chianina sires with the F, groups were also compared for preweaning growth (Fredeen et al 1988), postweaning growth (Rahnefeld et al 1988) and carcass characteristics (Rahnefeld et al 1983 Smith et al (1916a) and Notter et al (1978a).…”

Environmental and Genetic Effects on Preweaning Performance of Calves From First-Cross Cows. Ii. Growth Traits

“…Progeny from all dam crosses except the LH and LA at Manyberries grew more rapidly than their contemporary controls (HA progeny) Crossbreeding of beef cattle, specifically (Lawson et al 1980 (Lawson et (1970(Lawson et ( , 1971 and l9l2) were bred at 15 al. : Fredeen et ai.…”

“…1981a. Calf performmo of age to Red Angus and Beefmaster ance records for first parity (heifer production) bulls for their heifer production year were covered by Lawson et al (1980) …”

Economics of Calf Production With Foreign Cattle Breed Crosses in the Short-Grass Prairies

“…Heifer weight (Lawson et al 1980) Fredeen et al (1986Fredeen et al ( , 1987a. Daily DE requirements during summer lactation were fiom Fredeen et al (1987b) and are reported as an index relative to the HA (index 100 : 149.4 MJ DE d-r).…”

“…The replacement index, calculated from data on culled cows (Fredeen et al 1981b), provided a basis of estimating a rate of replacement specific to each first-cross. The final four columns of data in the table were the estimated growth rates (Lawson et al 1980;Fredeen et al 1981a) Calf birth weights were given separately for cows and heifers because easier calving breeds of sire, Red Angus and Beefmaster, were used on first-calf heifers. The weights were for male calves; female weights can be obtained from the female to male birth weight ratio.…”