To estimate the magnitude of sire of fetus (SOF) effects on productive and reproductive traits in females of Pitangueiras breed, 2287 lactations of 618 cows, daughters of 82 bulls, mated with 68 sires were analyzed. The statistical analyses were made using LSMLMW program (Mixed Model Least Squares and Maximum Likelihood Computer Program). Sire of fetus (SOF) did not affect the milk production in the subsequent lactation, however its effect was significant for the percent fat and production, days open, gestation […]

The present study was carried out to estimate the average lactation curve of 7239 lactations of Caracu cows based on 299,949 weekly records. The functions fitted to the mean data of the lactation curve were: Linear Hyperbolic and Logarithmic Quadratic as linear and Incomplete Gamma and Inverse Polynomial function as non-linear. The parameters were estimated by iterative methods, Gauss-Newton method. The adjusted Coefficient of Determination (R²A), the Durbin-Watson test (DW) and the deviations (%) from actual and predicted total milk […]

The objective of this work was to compare the alternative methods to estimate the milk yield of cows from Gyr breed. A total of 3,632 lactations from of Gyr breed cows, from 1986 to 1996, were analyzed. The methods were: A – the morning milking control was performed in the odd months and the afternoon milking control in the even months – the yield of the morning milking control was multiplied by the multiplicative factor of the morning (MF) and […]

The objective of this work was to determine the multiplicative factors to estimate the milk production (DP) based on the morning (MM) or afternoon (AP) milk yield and their were obtained of 3,632 lactations from 2,143 cows of the Gir breed, daughters of 335 sires, from 1993 to 1996 records. The calving year (Y) lactation length – linear (LL), calving age – linear and quadratic (A) and a factor K (the possible double, triple and quadruple interactions among management level […]

To evaluate the effects of cytoplasm lineage (CL) the body weight (BW, n = 707) and greasy fleece weight (FW, n = 703) of females and fiber wool diameter (FD, n = 350 males) of males sheep from yearling Merino sheep were used. The pedigree information included 3,645 animals and an average of 10 generations. The Maximum Restricted Likelihood methodology and animal models that included the direct genetic, direct and CL effects, direct, maternal and CL effects and direct, maternal, […]

To evaluate the effect of previous days dry (PDD) and days open (DO) on milk (M305) and fat (F305) yield in 305 days and milk (MDAY) and fat (FDAY) yield per day of calving interval in Holstein cows, a data set contained 5,454 lactations from the Minas Gerais Holstein Cattle Breeders Association were analyzed. The model included effects of: nucleus (5), heard-year: nucleus, genetic group (1- 31/32 Holstein, 2- upgraded Holstein with known genealogy and 3- pure of origin Holstein), […]

The objective of this experiment was to evaluate the performance up to 24 months of age of males from two breeding systems, straightbred (Charolais – C and Nellore – N) and crossbred (1/2 CN, 1/2 NC), submitted to two ages of weaning: T3-weaning at three months of age; T7-weaning at 7 months of age. The calves were maintained from birth to the weaning time with the cows on native pasture and, after weaning, both animals from T3 and T7 were […]

To study the effect of age upon ovulatory and fertility traits, 147 cycles of 99 mares were grouped in different age classes (1 – 3-6 years; 2 – 7-10 years; 3 – 11-14 years, and 4 – 15-19 years), according to the year of birth. The mares were inseminated with diluted, cooled and transported semen of one stallion only, three times a week (Monday, Wednesday and Friday). The follicular control, based on rectal palpation, and the teasing were conduced every […]

This experiment was conducted to evaluate the digestibility and total digestive nutrients (TDN) of poultry litter made from different types of absorbent materials. Twenty castrated sheeps of Morada Nova breed were allotted to metabolic cages and fitted with bag device for total feces collection. The experimental design was a randomized block with four treatments and five replicates. The treatments consisted in alternatives sources of poultry litter: A – wood shavings, B – elephant “Napier” grass, C – corncob with husks […]

Two experiments were conducted to evaluate the performance and nutrient digestibility (dry matter, organic matter and gross energy, and the metabolization coefficient of the gross energy) of triticale based diets. The treatments consisted in a corn and soybean meal based diet and three other ones with corn 33, 66 and 100% of substitution of corn by triticale. In the first experiment, 144 pigs in the growing phase (25.27-59.60 kg LW) were allotted to a randomized block design, with four treatments, […]