Twenty-seven growing buffaloes of Mediterranean breed were maintained in feedlot for about 140 days with the objective to evaluate the effects of energy intake on the performance and blood serum concentrations of glucose, total protein and urea. The treatments were constituted of three different levels of energy intake: LE (Low Energy), RE (Required Energy) and HE (High Energy). RE was calculated with 125 kcal/kg0.75/day of metabolizable energy for maintenance; LE with 20% below and HE with 20% above of this […]

Blood were collected daily from 16 Nelore heifers confined, for radioimmunoassay (RIA).analyses of progesterone The plasma progesterone assay were at day zero (estrus) and at each three days until the -1 and the day zero.again The animals were divided in two groups: 1) with regular estrous cycle of 21 days (heifers with two and three follicular growth waves) and 2) with prolonged estrous cycle, greater than 25 days (heifers with four follicular growth waves). The mean plasma progesterone level from […]

An experiment was conducted to study the effects of L-Glutamic acid (L-Glu) and vitamin D3 on the performance of one-day-old male Hubbard broiler chicks, reared in heated batteries, for a 14 days period. The chicks were fed purified diets containing all essential L-amino acids, minerals, and vitamins (except Vitamin D3) and were supplemented with three levels of L-Glu (5, 10 and 15%) and with four levels of vitamin D3 (0; 5,000; 10,000 and 15,000 IU). The experimental design was a […]

Photosynthetic pigment content, specific leaf mass (SLM) and carboxilative efficiency curves were obtained in response to sunlight in eight genotypes of elephantgrass selected according to productivities during the rainy season: cv. mineiro, CNPGL 91-01-2, CNPGL 91-02-4, CNPGL 91-19-1, cv. taiwan A-146, CNPGL 91-27-5, CNPGL 91-27-1 and CNPGL 91-10-2. Photosynthetic pigments were highly correlated, as well as chlorophyll a/b ratio (ABR) and chlorophyll/carotenoid ratio (CCR). Chlorophyll a and b contents were highest in taiwan A-146 genotype. SLM values indicated smaller dry […]

The data utilized in this work were originated from 53.938 pure and crossbred (Angus x Nelore), collected in different regions of Brazil and Argentina born from 1987 to 1998 were analyzed. The objectives of this work were to verity the heritabilities and correlation among the growing and scrotal circumference traits. The variables analyzed were the average daily gain from birth to weaning (ADGBW), days to reach 160 kg from birth to weaning (D160), weaning weight (WW) and scrotal circumference at […]

Fifteen growing buffaloes of the Mediterranean breed were fed in feedlot for aproximately 140 days with the objective to evaluate three different levels of energy ingested on carcass characteristics. The animals were slaughtered when they reached body weight above 450 kg. The average body weight was 465 kg +/- 16.29 kg. The average metabolizable energy intake estimated for the three treatments were: 18.23, 19.54 and 21.74 Mcal/animal/day. There were no significant differences among treatments in the hot and cold dressing […]

The objective of this experiment was to study the progesterone plasma concentrations in crossbred heifers, and the correlation with lipid metabolites concentrations. Twenty-six heifers were distributed into two treatments: T1 – treated with 500 mg sometribove zinc (recombinant bovine somatotropin) on day 3 of superovulated estrous cycle and T2 – control. The blood samples were collected during two estrous cycles: normal and superovulated one. The progesterone and metabolic lipids concentrations were determined by RIA and enzymatic method, respectively. The experimental […]

Five rumen fistulated steers were used to study sugar cane degradation with several protein sources through in situ method. The treatments were sugar cane and urea; sugar cane and soybean meal; sugar cane, soybean meal and urea; sugar cane and corn gluten meal; sugar cane, corn gluten meal and urea; and at 3, 6, 12, 24, 48, 72, 96 and 120 hours of incubation. After the incubation period, ammonia concentration and pH were determined in the ruminal fluid, sampled at […]

The aim of this study was to describe the population structure of the registered Red Sindhi cattle in Brazil. Descriptive statistics of the distribution of the number of progeny are presented, and the generation interval and effective population size were estimated, using pedigree records of animals registered from 1955 to 1998. The observed generation interval for the whole time period was 7.65 yr, and for the period 1994-1998 it was 7.96 yr. The effective population size for the following periods […]

Feedlot parameters of two categories of cull females, cows and heifers, fed two diets, with and without monensin, were studied. The daily amount of monensin supplied was 150 mg/animal. The roughage:concentrate ratio was 65:35. The roughage used was sorghum silage. The inclusion of monensin to the diet caused a significant reduction of the daily voluntary dry matter intake (DDMI), which was more pronounced for the cows (9.1%) than for the heifers (1.7%). The animal category x diet interaction affected significantly […]