Carla Wanderley Mattos

Meat quality of Moxotó and Canindé goats as affected by two levels of feeding

The objective of this study was to evaluate the effect of reduced feed intake on Moxotó and Canindé goat, which are native breeds of semi arid area of Brazil, by analyzing the resultant meat quality. Intact male goats of both genotypes (10 animals each), weighing about 15kg, were allocated to two feeding levels (AL: feed ad libitum and FR: feed restricted to 63% of the total feed consumed by AL). Water-holding capacity and a(∗) color parameter were significantly influenced (p<0.05) by genotype. Proximate composition, cholesterol, shear force, pH, cooking loss, and sensory scores did not differ significantly (p>0.05) between genotypes. The redness of the meat of the Canindé breed was much improved in FR goats. Although, feed restriction by 37% did affect the final live weight and mean daily gain weight, it had no effect on chemical, physical, and sensory quality of Moxotó and Canindé meat.

Características de carcaça e dos componentes não-carcaça de cabritos Moxotó e Canindé submetidos a dois níveis de alimentação

Twenty-two non-castrated male kids (10 Moxoto and 12 Caninde) averaging 15 kg of initial body weight and housed in individual pens were used in this trial. Animals were assigned to a completely randomized design in a 2 x 2 factorial arrangement of treatments [two breeds and two feeding levels: ad libitum (AL) or 30% of feed restriction (FR). Animals fed AL had greater yields of hot carcass, cold carcass, and carcass edible parts compared to those fed FR. It was not observed a significant feeding level effect on true carcass yield. After slaughter and cooling of the carcasses the following cuts were done: neck, shoulder clod, ribs (1st-5th and 6th-13th), loin, leg and breast. Although animals fed AL had greater body weights than FR kids, no significant differences were found between treatments for the different carcass cuts when expressed as percentage of cold carcass weight. Hind leg yield was affected by feeding level being lower in animals fed AL. Yields of liver, head, and gut, as percentage of empty body weight, were also affected by feeding level. Feed restriction had a negative effect on development and tissue deposition leading to lower cold carcass yield and weight. It can be concluded that when size and mature weight were similar, breed was not responsible for the differences on carcass characteristics, non-carcass components, and commercial cuts.

Body composition and energy requirements for weight gain of growing Moxotó goat kids

Twenty-six Moxoto non-castrated males kids, with average 15 kg BW and 7 to 8 mo old, were fed a diet containing 2.6 Mcal/kg ME were used to evaluate the body composition and energy requirements for weight gain. At the beginning of the experiment, six animals were slaughtered as a reference to estimate initial body composition and initial empty body weight (EBW). While, the remaining animals (four groups of five animals, one for each feeding regime, were distributed to a completely randomized experimental design, with four feeding regime (100% or ad libitum (AL), and 85, 70 or 55% of the intake recorded for the animals from the AL group) and five replications. As the animals from the AL group approached 25 kg BW, an animal from each feeding regime was slaughtered. Logarithm (log) equations body fat (BFC) and energy (BEC) content were fitted on log10 of EBW. The concentration of water in the body of animals was low, however, the deposition of fat, protein and ash content increased with the maturity of animals. There was an increase from 78.55 to 125.38 g/kg of EBW in BFC and from 1.90 to 2.34 Mcal/kg of EBW in BEC with the increase from 15 to 25 kg of LW of the animals. There was a positive linear relationship between energy composition of gain in EBW (EBWG) (Mcal/kg EBWG) and EBW. Similar response was observed to BFC in the gain. The body fat (g) and energy (Mcal) contents of Moxoto goats kids increased from 14.33 to 22.87 and 0.26 to 0.32 per 100 g of EBWG, respectively, as EBW increased.

Composição corporal e exigências de proteína para ganho de peso de caprinos Moxotó em crescimento

Twenty-six Moxoto non-castrated male kids (initial mean 15 kg LW and 7-8 month old) fed a diet with 2.6 Mcal ME were used to evaluate the body composition and protein requirements for weight gain. At the beginning of the experiment, six animals were slaughtered as reference to estimate initial body composition and initial empty body weight (EBW). Subsequently, homogeneous groups of four animals were distributed a complete randomized experimental design into two feeding regimes: ad libitum feeding (AL) and feed restriction of 85, 70 and 55% of that consumed by the AL feeding group. The animals from each feeding regime were slaughtered at the time the group of the AL feeding approached 25 kg LW. Logarithm equation of retained body protein contents (BCP) was fitted on log10 of empty body weight (EBW). By deriving this equation, the predicting equation of BCP per kg of EBW gain was obtained. The protein content of the animals remained practically constant and ranged from 205.60 to 201.69 g/kg of EBW (reduction of 1.9%) and 15 to 25 kg with the increase of live weight. Despite of small body changes of net protein requirements (19.86 to 19.49), the fat: protein ratio increased with the increase in LV from 15 to 25 kg.

Metabolic profile of lactating goats fed integral mango meal

The work was conducted to evaluate the metabolic profile of lactating goats fed diets containing integral mango meal as a replacement for corn. Four levels of replacement (0, 33, 66 and 100%) were evaluated in diets with forage:concentrate ratio of 60:40. Eight crossbred multiparous lactating Saanen goats (48.72 ± 1.99 kg of BW) were introduced in the experiment 48 days postpartum and maintained up to 124 days of lactation. It was used a double Latin Square (4x4) experimental design, with four treatments, four periods and four animals per square. There was no effects (P>0.05) for the integral mango meal level on the intake of DM (1890 g/day), CP (278 g/day) and NDF (959 g/day). However, the intake of NFC and TDN decreased (P 0.05) by replacement levels, with average values of 54.52 mg/dl, 0.71 mg/dl, 52.59 UI, 77.37 UI, 4.69 g/dl, 9.32 g/dl, 74.44 mg/dl, 40.10 mg/dl, 39.39 mg/dl, and 11.09 mg/dl, respectively. Considering the metabolic profile, mango meal whole can totally replace corn in diets of dairy goats.