The objective of this work was to determine genetic parameters for body weight of tinamou in captivity. It was used random regression models in analyses of data by considering the direct additive genetic (DA) and permanent environmental effects of the animal (PE) as random effects. Residual variances were modeled by using a fifth-order variance function. The mean population growth curve was fitted by sixth-order Legendre orthogonal polynomials. Direct additive genetic effects and animal environmental permanent effect were modeled by using […]

The objective of this work was to evaluate the effects of levels of nucleotides in diets for weanling pigs on performance, organs morphometry and histology of intestinal epithelium. One hundred and forty-four pigs weaned at 21 days of age and with 5.80 ± 0.16 kg initial live weight were used in a completely randomized experimental design with six diets, six replications per diet and four animals per pen (experimental unit). Diets were: Am _ antimicrobial: basal diet with 40 ppm […]

The objective of this work was to estimate requirements of digestible methionine + cystine for broiler chickens from 1 to 42 days of age. It was carried out four experiments for each one of the following phases: pre-initial, initial, growing and final. The birds were distributed in a completely randomized experimental design, with six treatments and six replicates. Treatments consisted of a basal feed for each phase, deficient in digestible methionine + cystine and supplemented with DL-methionine to supply six […]

The effect of cooling the forrowing cage floor on production performance of lactation sows in the summer was evaluated. Forty-two sows from to the 1st to the 5th parturition were allotted to a completely randomized block experimental design with three treatments and 14 repetitions, considering each animal an experimental unit. The treatments were the following: floor not cooled and free intake; floor cooled and 5.5 kg/day of intake; floor cooled and free intake. The sows maintained in cage with cooled […]

To estimate the digestible lysine requirements for maintenance of roosters of different genotypes and body weight (Leghorn, ISA Label and Cobb 500), it was carried out three metabolic trials using the nitrogen balance (NB) technique. The birds were distributed in a completely randomized design with five levels of digestible lysine and six replications, and the experimental units consisted of one (trial 1) or two birds (trial 2 and 3). In each trial, the requirement of lysine for maintenance was obtained […]

The objective of this study was to evaluate the productive performance of broiler breeder hens fed diets containing aflatoxins and adsorbent on the basis of esterified glucomannan. It was used 300 Ross 308 females and 40 males broiler breeders, housed in 20 experimental pens in the 61-72 week of age phase. From the 61st to the 68th week, birds were fed diets containing three levels of aflatoxin (0; 0.500; 0.750 mg/kg) combined or not to adsorbent (0.10%) and on the […]

An experiment was carried out using 468 gilts, with an initial weight of 84.77 ± 7.20 kg and allotted into 36 pens to evaluate the effect of the addition of ractopamine in the diets on performance, characteristics and yields of carcass comercial cuts, composition and retail cuts of ham. It was used a randomized block design with four levels of ractopamine (0, 5, 10 and 15 mg/kg of diet) and nine replicates with 13 animals per experimental unit. The initial […]

In this work, it was evaluated the ingestive behavior of indigenous goats from the northeastern semiarid region, kept in feedlot. Forty castrated males, 20 from Moxotó and 20 from Caninde breeds, with average initial weight of 15.22 kg ± 1.78 kg, were used. The goats were distributed in a completely randomized design in a 2 × 2 factorial arrangement with two breeds and two diets. Two experimental diets were evaluated: diet with lower energy level (2.2 Mcal ME/kg dry matter […]

The objective of this work was to evaluate the effect of multiple supplement with different levels of castor meal (Ricinus communis L.) treated with calcium oxide on intake, on the total apparent digestibility of dietary components, on the efficiency of microbial synthesis and on the performance of beef heifers grazing Brachiaria decumbens during the dry-rainy transition period. The experimental area was composed of five 2.5-ha paddocks with availability of potentially digestible dry matter of 2,858.4 kg/ha. It was used 25 […]

The objective of this work was to evaluate the effect of using multiple supplements with different levels of cottonseed meal 38% on intake, total apparent digestibility of dietary components, efficiency of microbial synthesis and productive performance of beef heifers in Brachiaria decumbens pasture during the rainy season. It was used 25 Nellore heifers and 10 crossbred heifers with predominance of Zebu breed at 16 months of age and with 249.8 ± 0.6 kg of body weight. It was used a […]