Estimation of individual and maternal additive genetic and heterotic effects for preweaning traits of crosses of Ayrshire, Brown Swiss and Sahiwal cattle in the lowland tropics of Kenya

Genetic evaluation of Ethiopian Boran cattle and their crosses with Holstein Friesian for growth performance in central Ethiopia

“…(1994) who found a significant additive breed effect for BWT, WWT and preweaning average daily gain in crossbreeding study involving Jersey with Ghana Shorthorn and Sokoto Gudali cattle in a tropical environment. Kahi et al. (1995) on the other hand found non‐significant individual additive genetic effect in Ayrshire and Sahiwal breeds for BWT, WWT and preweaning average daily gain, however, for the B. taurus (Brown Swiss and Ayrshire)‐ B. indicus (Sahiwal) comparison, individual additive genetic effect approached significance (p < 0.l) for BWT.…”

Genetic evaluation of Ethiopian Boran cattle and their crosses with Holstein Friesian in central Ethiopia: milk production traits

“…For the regression analysis, coefficients of expected breed content and heterozygosity in the cow (Table 2) were fitted as covariates to obtain estimates of the individual additive (g i F), individual heterosis (h i BF) and maternal heterosis (h m BF) effects using similar procedures to those of Hirooka and Bhuttyan (1995) and Kahi et al (1995). Expected heterozygosity with respect to the genes of two breeds was calculated as the expected proportion of genes from the sire and dam, which differed with respect to the two breeds.…”

Efeitos genéticos aditivos e não-aditivos para características produtivas e reprodutivas em vacas mestiças Holandês × Gir

“…Os efeitos dos cruzamentos têm comumente sido estimados utilizando-se o método dos quadrados mínimos (Martinez et al, 1988;Madalena et al, 1990;Lemos et al, 1992;Rege et al, 1994;Kahi et al, 1995;Facó et al, 2002;Facó et al, 2005a). No entanto, a utilização dos modelos mistos tem se tornado largamente aceita (Komender & Hoeschele, 1989;Mackinnon et al, 1996;Kahi et al, 2000;El Fadili & Leroy, 2001;Demeke et al, 2004;Wolf et al, 2005).…”