An experiment was conducted to evaluate the effect of energy levels (2900-LE and 3200-HE- kcal ME/kg), physical form of the diet (mash-M and pellet with 2 mm-P2 and 4 mm-P4) and pair feeding (Pf), by feed restriction based in Ad libitum (Ad)/M/HE diets, on male broilers performance and carcass yield, from 21 to 42 days of age. There were 8 treatments, 5 replicates, 12 birds/replicate. In the P diets, only whole pellets were offered. At these conditions, there were no […]

Seventy five piglets with average initial weight of 5.8 ± .4 kg were used to evaluate the levels of threonine in the diets for piglets from 6 to 25 kg with high genetic potential for lean deposition. A randomized blocks design, with five treatments(threonine levels), five replicates and three animals by experimental unit was used. The treatments consisted of basal diet with 18% crude protein (CP) and 1.108% total lysine, supplemented with five levels of L-threonine, resulting in diets with […]

This experiment was conducted to evaluate the levels of total threonine in diets for gilts from 30 to 60 kg of live weight. Forty females, with initial average weight of 29.2 ± 1.4 kg, were used in an experimental design of randomized blocks, with five treatments (0.60; 0.65; 0.70; 0.75 and 0.80% of total threonine), four replications and two animals per experimental unit. The basal diet with 18% of crude protein and 0.928% of total lysine, attended the requirements of […]

The digestibility coefficients and thetrue digestible amino acids contents of corn and corn byproducts were determined by using cecectomized adult cockerels. Each one of the 11 feedstuffs evaluated was fed to six cockerels, consuming 15 g at 8a.m. and 15 g at 4p.m. after fastening by 24 hours. Simultaneously, six cockerels were fasted to determine metabolic and endogenous losses. After determination of the digestibility coefficients and calculation of the digestible amino acids, prediction equations were simulated to predict the corn […]

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 […]

An experiment was conducted to study the effects of three levels (5, 10 and 15%) of L-Glutamic Acid (L-Glu) and four levels (0, 5000, 10,000 and 15,000 IU/kg of diet) of vitamin D3 (VD) on bone parameters of 14 days male broilers, Hubbard. They were fed purified amino acid diets and reared in electrically heated batteries. The experimental design was a factorial 3 x 4 with four replicates with seven chicks each. The length of bones increased up to an […]

The experiment aimed to study the effects of three levels (5; 10; and 15%) of L-Glutamic Acid (L-Glu) and four levels of vitamin D3 (VD) on the chemical composition of bones of broiler chicks, Hubbard. The purified diets used contained all essential amino acids, vitamins and minerals at adequate levels and were supplemented with of L-Glu and with 0, 5,000, 10,000 and 15,000 IU of vitamin D3. The experimental design was a factorial 3 x 4 with four replicates with […]

This work aimed to evaluate the effect of the sorghum growth stage on the silage chemical composition, intake milk production and fat compared with corn silage to dairy cows. The experiment was carried out at the “São Bento do Una” research Stattion, from IPA, located in “São Bento do Una”, Pernambuco, Brazil. Nine holstein lactating cows were distributed in three Latin squares design. The squares were formed according to milk yield and the lactating order and consisted of three cows […]

The behavior of lactation curve of 31 crossbred Saanen dairy goats and the effect of two strategies of supplementation with concentrate: 30% of requirements in net energy from third week until the end of lactation (ESC.1); or 60% of requirements in daily net energy from the 3rd to the 13th week and 15% from 14th until the end of lactation (ESC.2), in a pasture or semi-confined systems, were studied. The following models were evaluated: Wood linear and non-linear, Morant linear […]

The experiment was conducted to evaluate the parameters of dry matter intake, weight gain, feed conversion and energy efficiency of feedlot steers, fed with four diets that included silage of hybrids of sorghum with different agricultural behavior: AGX-213 and AG-2002 (forage), AGX-217 and AG-2005E (double purpose). Forty-eight steers with an average age of 19 months and average live weight of 316 kg, were used. The roughage:concentrate ratio was 63:37, for all the diets tested. No significant interaction was observed between […]