Production of low cost milk is the most relevant aspect in dairy goat systems. Therefore, studying the behavior of the lactation curve of dairy goats is important to implement animal breeding programs as well as for plan and introduce new management tools. The objective of this study was to select among mathematical models published in the literature the one that best describe the lactation curve of dairy goats. A dataset constituted of 23,502 observations of milk yield from 748 lactations […]

The objective of this trial was to evaluate production of nursing ewes and yearling female lambs grazing annual ryegrass pasture (Lolium multiflorum Lam) supplemented or not with corn grain or soybean meal. Supplements were fed to animals in a quantity equivalent to 1% of sheep unit (ewe + lamb) body weight. The following variables were investigated: average daily gain, body weight gain per hectare, and stocking rate while for ryegrass pasture the following measurements were taken: forage mass, losses, and […]

The effect of two genetic groups, Aberdeen angus (AA) and 50% Nellore x 50% Aberdeen angus (NA), on temperament and meat quality of 40 steers averaging 2 years of age and 336.4 ± 29.39 kg of body weight was evaluated in this trial. Animals were assigned to treatments according to a completely randomized design. Temperament was evaluated through measurements of composite behavior score (BS) and flight time (FT). NA steers had higher BS than AA steers in this trial. Conversely, […]

The objective of this trial was to evaluate the total replacement of corn with a dry residue extracted from cassava starch on production of crossbred heifers in feedlot. Thirty crossbred heifers averaging 21 months of age and 325 kg of body weight were distributed in two experimental groups and then housed in two stalls. Both groups were submitted to a pre-trial period of 49 days, in which animals received ad libitum sorghum silage and 1.05% of body weight as concentrate […]

This research aimed to compare dry matter digestibility coefficient (DMDC) of horse diets by total feces collection (TC) and internal markers, indigestible cellulose (iCEL), indigestible acid detergent fiber (iADF) and acid insoluble ash (AIA). Sixteen adult mares of Mangalarga Marchador breed averaging from 3.5 to 18.4 years and 394.80 ± 46.22 kg were assigned to a randomized block design with four replicates. Diets were formulated to be isoprotein and isoenergetic and composed of coastcross hay (Cynodon dactylon cv. Coast cross) […]

Two trials were conducted to determine the requirement of methionine + cistyne for Ross female broilers from 1 to 21 and 22 to 42 days old on tropical climate region. The following parameters were evaluated: feed intake, weight gain, feed: gain ratio, absolute weights and yields of noble cuts (breast, thighs and drumsticks) and abdominal fat. The experiment was analyzed as a complete randomized design with six levels of methionine + cystineand four replicates of 12 birds per replicate, in […]

The effect of decreasing dietary CP and supplementation of lysine and methionine+cystine on the performance of 270 laying hens Lohmann LSL strain was evaluated in this trial. The birds averaging 26 weeks of age were allotted to a stocking rate of 562 cm2/bird as a completely randomized design with five replicate of six birds. The treatments were as follows: T1 = control diet (CD) with 16.5% CP, 0.80% of lysine (L) and 0.70% of methionine+cystine (MC); T2 = 15.25% CP, […]

This trial was conducted to evaluate the dietary levels of digestible threonine for growing gilts on heat stress environment. Seventy crossbreed gilts averaging initial weight of 14.9 ± 0.56 kg were assigned to a complete randomized blocks design with five treatments (levels of digestible threonine) of seven replications (two animals per experimental unity). The treatments consisted of the following dietary digestible threonine levels: 0.538, 0.577, 0.614, 0.651, and 0.688%. Daily weight gain and threonine intake linearly increased as the dietary […]

A trial was conduced to evaluate decreasing levels of CP with amino acid supplementation on performance of gilts on thermoneutral environment. Thirty-five crossbreed gilts (Landrace x Large White) averaging initial weight of 60.5 kg were allotted to a complete randomized design with five treatments (17.3, 16, 14.7, 13.4 and 12.1% of CP) of seven replications (one animal per experimental unit). The experimental diets were fed ad libitum until the end of the experiment when the animals reached the average weight […]

This study was carried out to evaluate the effect of environmental temperature on performance, carcass composition and physiological parameters of pigs from 30 to 60 kg of weight. Thirty six barrow (Landrace x Large White) with initial weight of 29.94 ± 0.49 kg, were assigned to a completely randomized experimental design with three treatments six replicates and two animals per experimental unity. The experimental period lasted 35 days. The treatments consisted of T1 Animals on heat stress (32ºC) fed ad […]