ABSTRACT We aimed to verify whether age influences the biochemical profile of healthy lambs during the first four months of life by characterizing the dynamics of its parameters and verifying whether there are differences between the profiles of growing animals and the reference values established for adults. Blood samples of 34 ½ White Dorper × ½ Suffolk female lambs were collected at 30, 60, 90, and 120 days of age, and the serum concentrations of total proteins, total globulins, albumin, […]

This investigation was carried out to evaluate certain egg quality characteristics of ISA Brown laying hens and Japanese quails (Coturnix coturnix japonica) in relation to their age. One hundred forty-four brown-egg ISA Brown laying hens and one hundred female quails were used in the study. A total of 1,678 eggs of laying hens and 2,060 eggs of Japanese quails were used during the experiment. The eggs for technological values were collected during two consecutive days in a 4-week period when […]

Data consisting of 38,865 records of Large White pigs were used to estimate genetic parameters for days to 100 kg (DAYS) and backfat thickness adjusted to 100 kg (BF). Covariance components were estimated by a bivariate mixed model including the fixed effect of contemporary group and the direct and maternal additive genetic, common litter and residual random effects using the Gibbs Sampling algorithm of the MTGSAM program. Estimates of direct and common litter effects for DAYS and BF were 0.33 […]

The objective of this work was to evaluate the effects of sex, sub-region, age at registration and year of registration, on 15 linear measures (withers height, back height, croup height, midback height, head length, neck length, back-loins length, croup length, shoulder bone length, body length, head width, chest width, hip width, thorax perimeter and shin bone perimeter) of the Pantaneiro horse. Data from 1214 animals were used, registered in the Brazilian Pantaneiro Horse Association, from 1972 to 1991, and analyzed […]

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 […]