Effect of the diet on performance characteristics and quality of meat fat of lamb by principal component analysis

The objective of this study was to evaluate the effect of use of agroindustrial co-products in the diet of lambs on the performance and nutritional quality of meat fat. Twenty lambs were distributed into four experimental groups: control diet (C) or diets containing cottonseed (CS), sunflower meal (SFM), and castor cake (CC). During the experimental period, data on dry matter consumption (DMC) and total weight gain (TWG) were collected. After slaughter, samples of Logissimus dorsi (LD) muscle were taken for fatty acids and cholesterol analysis. Diets C and CS provided similar characteristics of fat quality and animal performance. However, SFM and CC diets tend to form isolated groups, with different fat and performance characteristics. The SFM diet results in meat with a higher saturated fatty acids and cholesterol content. The CC diet is related to improved performance characteristics and lower cholesterol content. In conclusion, the inclusion of CC in the experimental diets provided, in the proportions used in this experiment, better characteristics of animal performance and meat fat quality.(AU)

Effect of the diet on performance characteristics and quality of meat fat of lamb by principal component analysis

The objective of this study was to evaluate the effect of use of agroindustrial co-products in the diet of lambs on the performance and nutritional quality of meat fat. Twenty lambs were distributed into four experimental groups: control diet (C) or diets containing cottonseed (CS), sunflower meal (SFM), and castor cake (CC). During the experimental period, data on dry matter consumption (DMC) and total weight gain (TWG) were collected. After slaughter, samples of Logissimus dorsi (LD) muscle were taken for fatty acids and cholesterol analysis. Diets C and CS provided similar characteristics of fat quality and animal performance. However, SFM and CC diets tend to form isolated groups, with different fat and performance characteristics. The SFM diet results in meat with a higher saturated fatty acids and cholesterol content. The CC diet is related to improved performance characteristics and lower cholesterol content. In conclusion, the inclusion of CC in the experimental diets provided, in the proportions used in this experiment, better characteristics of animal performance and meat fat quality.

Caracterização do pasto e da extrusa de novilhas Girolanda, em pastagem de Brachiaria decumbens, submetidas a diferentes taxas de lotação / Characterization of grass and extrusa from Girolanda heifers grazing on Brachiaria decumbens pasture, under different stocking rates

O objetivo deste trabalho foi avaliar as características do pasto e da extrusa de novilhas Girolanda, submetidas a três taxas de lotação, em pastagem de capim Brachiaria decumbens Stapf., em diferentes períodos de avaliação. Foram utilizadas seis novilhas da raça Girolanda e os tratamentos foram constituídos por diferentes taxas de lotação (2, 4 e 6 UA); cada bloco foi formado por três piquetes. O delineamento foi de blocos ao acaso em parcelas subdivididas com medidas repetidas no tempo. A taxa de bocados dos animais variou com o período de avaliação, com valores de 41 bocados min.-1 (Período 1) e 33 bocados min.-1 (Período 3). A taxa de bocados reduziu ao longo dos períodos de pastejo com valores de 41 a 33 bocados min.-1 Já o tamanho do bocado apresentou valores maiores nos períodos de avaliação 2 e 3, na taxa de lotação 2 UA (0,40 e 0,43 g MS bocado-1). A matéria seca da extrusa apresentou valores maiores no 3° (15,0% de MS) e 2° (17,4% de MS) dia de pastejo. O aumento no teor de proteína bruta da extrusa ocorreu no terceiro período de pastejo (14,4%) e no teor de fibra em detergente neutro (75,3%).

The objective of this study was to evaluate the characteristics of the grass and extrusa from Girolanda heifers, under three stocking rates on grass pasture of Brachiaria decumbens Stapf., at different evaluation periods. Six Girolanda heifers were used, and treatments consisted of different stocking rates (2, 4 and 6 UA). Each block was formed by three paddocks. The design was a randomized blocks design in split-plot with repeated measures over time. The bite rate of the animals varied according to assessment period, with values of 41 bites min.-1 (Period 1) and 33 bites min.-1 (Period 3). Bite rate decreased over the grazing period, with values from 41 to 33 bit min-1. Bite size was larger in grazing periods 2 and 3, at the stocking rate of 2 UA (0.40 and 0.43 g DM bite-1). Extrusa dry matter was higher in the third (15.0% DM) and second (17.4% DM) days of grazing. An increase in crude protein content of extusa occurred in the third grazing period (14.4%) and for total neutral detergent fiber (75.3%).