ABSTRACT The present study aimed to evaluate the growth of Criollo foals from birth to 800 days of age using Brody, Gompertz, Logistic, and Von Bertalanffy nonlinear models. The data utilized consisted of weight, height, chest circumference, and shin circumference taken from 75 foals kept in southern Brazil. Morphometric traits analyzed showed mean values ranging from 63 to 325 kg for weight, 0.92 to 1.32 m for height, 0.88 to 1.58 m for chest circumference, and 0.12 to 0.18 m […]

ABSTRACT The experiment aimed to evaluate the effects of supplementing a standard broiler diet, formulated based on corn and soybean meal (CSBM), with two levels of an exogenous enzyme (EZ) cocktail (0 and 0.05%), under two dietary metabolizable energy (ME) levels – normal (positive control, PC) and low (negative control, NC). From 0 to 35 d, 288 Ross 308 chicks were distributed across four treatments with 12 replicates of six chicks each. Growth performance was evaluated during the starter, grower, […]

ABSTRACT To understand the developmental expression patterns of key genes in the Toll-like receptor 4 ( TLR4 ) pathway and their regulatory characteristics in the immune response in pigs, we examined TLR4 and its downstream genes expression levels in the intestinal and immune tissues of Meishan pigs. The genes were expressed in all examined tissues at the different developmental stages. TLR4 expression was higher in spleen and lower in other tissues. Spleen and lymph TLR4 expression was significantly lower in […]

ABSTRACT This study aimed to determine the length-weight relationship and mathematical models to predict dressed and fillet weight and yield and fillet composition of wild traíra, Hoplias malabaricus (Bloch, 1794). A total of 80 marketable-sized fish from 292.28 to 2879.57 g and 32.06 to 61.19 cm were used. The length:weight ratio was estimated using the equation: , in which W is body weight (g) and L is length (cm). The models of dressed and fillet weight and yield and body […]

ABSTRACT We evaluated the technical feasibility of purified glycerin inclusion in balanced diets of broiler chickens treated from 1 to 42 days of age. A total of 240 broiler chickens were distributed in a completely randomized design into four treatments (0, 2, 4, and 6% purified glycerin inclusion), with six replicates of 10 broilers each. We evaluated productive performance (at 7, 21, and 42 days), edible viscera (heart, liver, and gizzard), carcass yield and cuts, color, chemical and physical composition, […]

ABSTRACT A total of 5502 piglets from 435 sows were selected for evaluation of the effect of piglet birthweight and sow parity on mortality rate (MR), growth performance, and carcass traits in pigs. Piglets were distributed into one of eight categories according to their weight (1801 g) and sows were classified according to parity (1-5). The maximum MR during lactation (day 0 to day 21) was found in category

ABSTRACT The objective of this study was to describe the growth of freshwater angelfish (Pterophyllum scalare) using the Gompertz model, determining the relative growth and allometric coefficients of body components in relation to body weight and protein weight. Six hundred animals were grown until 233 days of age. Data on chemical composition (water, lipid, protein, and ash) and weight measurements were obtained each 30 days. The Gompertz growth equation was used to analyze chemical allometry and to estimate growth parameters. […]

In the present study, alternative and traditional nonlinear models to describe growth curves of Morada Nova sheep reared in the state of Bahia, Brazil, were applied. The nonlinear models were: Schnute, Mitscherlich, Gompertz, Logistic, Meloun I Meloun II, III Meloun, Gamito and Meloun IV. The model adjustment was evaluated by using: Adjusted Coefficient of Determination (R2aj), Akaike Information Criterion (AIC), Bayesian Information Criterion (BIC), Mean Squared Error of Prediction (MEP) and Coefficient of Determination of Prediction (R2p). The selection of […]

Para comparar a influência da heterogeneidade da variância residual nos parâmetros genéticos estimados para a curva de crescimento de codornas de corte, foram utilizados dados provenientes de 26.835 e 27.447 observações, de 3.909 e 4.040 codornas de corte das linhagens UFV-1 e UFV-2, respectivamente. Foi avaliado o peso corporal nas duas linhagens, aos 1, 7, 14, 21, 28, 35 e 42 dias de idade, por meio de modelo animal em regressão aleatória, considerando na modelagem as variâncias residuais em classes […]

Funções polinomiais da idade de diferentes ordens foram avaliadas na modelagem da trajetória média de crescimento de ovinos Santa Inês em modelos de regressão aleatória. As análises foram executadas inicialmente desconsiderando o efeito de animal. Posteriormente, as análises de regressão aleatória foram realizadas incluindo-se os efeitos aleatórios de animal e da mãe (genético e de ambiente permanente). O ajuste linear foi inferior, e as demais ordens foram semelhantes até próximo dos 100 dias de idade. A função cúbica proporcionou o […]