Reproductive Performance of Crossbred and Straightbred Cattle on Different Pasture Programs in Florida

Animal production studies in Jamaica. V. Live-weight production from pangola grass pastures used for rearing and fattening beef cattle and the economic implications of the yields

“…per Within the herds on these farms, there was very little evidence that improved pastures increased cow fertility, and no adjustment was made for this factor. Higher fertility has, however, been noted on improved pastures elsewhere (Koger et al 1962). Where this existed it would obviously increase the number of calves weaned and hence tho live-weight output per acre.…”

Effects of creep feeding, zeranol and breed type on beef production /

“…Rate of reproduction in beef cattle is the most important trait influencing the economy of beef production. Many researchers reported that crossbred females were superior to straightbred cows for reproductive rate (Koger et al, 1962a;Turner et al, 1968;Peacock et al, 1971;Peacock and Koger, 1980 (Peacock et al, 1977) from straightbreeding and reciprocal crossing of Angus, Brahman…”

Bos indicus x Bos taurus gene proportion overweaning weight and age at first parturition in amulti-breed population

“…Cualquiera que sea el cruzamiento entre razas, se observará respuesta de vigor híbrido; sin embargo, para mantener niveles aceptables de heterosis en la población, es necesario establecer esquemas de cruzamiento que maximicen la respuesta de las características de interés del productor. Los efectos de cruzamientos entre dos o más razas ha sido ampliamente referido en la literatura (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12) , mostrando las ventajas que se obtienen debido a la heterosis, ya sea individual o materna, para características productivas y reproductivas en ganado de carne (13) . La mayor respuesta se alcanza cuando los animales cruzados presentan el 100 % de heterosis, resaltando la importancia de cruzamientos sistemáticos entre las diferentes razas, y explicado como la superioridad de los animales cruzados con respecto a las razas originales.…”

“…Hybrid vigor occurs no matter the cross combination, but maintaining acceptable heterosis levels requires crossing systems that maximize response for desired traits. Extensive research into crossbreeding between two or more breeds (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12) has shown that heterosis, be it individual or maternal, produces benefits for productive and reproductive traits in beef cattle (13) . Response is optimum in animals with 100 % heterosis, highlighting the importance of systematic crossbreeding and the superiority of cross-bred animals versus the original breeds.…”

“…The present study objective was to determine the optimum Bos Indicus:Bos taurus gene proportion and retention of heterosis for 207-d adjusted weaning weight and age at first parturition in a multi-breed population of crossbred beef cattle in the tropics of Mexico. [19], Simmental [10], Holstein [16], Salers [3]), and the remaining 50 were crosses with proportions of these breeds ranging from 6.25 to 75 %. Analysis was done of their contributions to the variables 270-d adjusted weaning weight (WW, in kilograms) and age at de Hueytamalco, Puebla, México ubicado en la sierra nororiente del estado de Puebla y con clima subtropical húmedo-semicálido Af(c).…”