ABSTRACT Mothers must allocate limited resources between raising their offspring and maintaining their own biological functions. In both wild and livestock populations, food availability fluctuates with climate, soil fertility, and rainfall, challenging mothers and calves when environmental quality declines. This study evaluated whether maternal investment is influenced by progeny sex and environmental conditions, using coefficients of variation as a measure of evolvability. We analyzed three pre-weaning growth traits in cattle: birth weight (BW), body weight at 120 days (BW120), and […]

ABSTRACT We aimed to estimate litter size and litter uniformity genetic parameters and genetic trends of Landrace pigs at birth and at three weeks by using multitrait analyses for 2,787 litters. The following litter traits were evaluated: number of piglets born alive (NBA), within-litter weight mean at birth (MBW), within-litter weight standard deviation at birth (SDB), within-litter weight coefficient of variation at birth (CVB), number of piglets at three weeks (NT), within-litter weight mean at three weeks (MT), within-litter weight […]

Avaliou-se a variabilidade espacial e temporal de características descritoras da condição de pastos diferidos de Brachiaria decumbens cv. Basilisk (capim-braquiária). Os tratamentos consistiram de combinações dos períodos de diferimento da pastagem (73, 103, 131 e 163 dias) com os períodos de pastejo (29, 57 e 85 dias). Utilizou-se esquema de parcelas subdivididas e delineamento em blocos casualizados com duas repetições. Foi determinada a dispersão dos valores de altura do pasto, altura da planta estendida e do índice de tombamento do […]