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Santos F.A.,Federal University of Vicosa | Donzele J.L.,Federal University of Vicosa | Silva F.C.O.,Epamig | de Oliveira R.F.M.,Federal University of Vicosa | And 4 more authors.
Revista Brasileira de Zootecnia | Year: 2011

This study was carried out to evaluate the effects of increasing levels of digestible methionine+cystine on performance and carcass composition of high genetic potential barrows for lean deposition. Sixty-four barrows with initial weight of 95.46 ± 1.09 kg were allotted to a completely randomized block design, with four levels of digestible methionine+cystine (0.427, 0.466, 0.504, and 0.545%, corresponding to the digestible methionine+cystine:digestible lysine ratios of 57.0, 62.0, 67.0 and 73.0%, respectively), with eight replicates, and two animals per experimental unit. Experimental diets and water were provided ad libitum until the end of the experimental period when pigs reached 125.21 ± 2.49 kg. Levels of digestible methionine+cystine did not affect daily intake, daily weight gain and feed conversion of the animals, but they affected daily intake of digestible methionine+cystine which increased linearly. Levels of digestible methionine+cystine did not affect carcass weight, meat amount, backfat thickness at P2, and daily meat deposition. The digestible methionine+cystine level of 0.427%, corresponding to the digestible methionine+cystine:lysine ratio of 57.0% and to a daily digestible methionine+cystine intake of 14.20 g/d, provides the best performance and carcass traits for high genetic potential barrows in the phase of 95 to 125 kg. © 2011 Sociedade Brasileira de Zootecnia. Source


Santos F.D.A.,Agroceres Nutricao Animal | Donzele J.L.,Federal University of Vicosa | Silva F.C.D.O.,Epamig | de Oliveira R.F.M.,Federal University of Vicosa | And 4 more authors.
Revista Brasileira de Zootecnia | Year: 2011

This work evaluated levels of digestible lysine on performance and carcass composition of barrows with high genetic potential for meat deposition. It was used 80 animals with initial body weight of 95.55 ± 1.04 kg, distributed in a completely randomized block design, with 5 diets (0.540; 0.642; 0.744; 0.846 and 0.948% of digestible lysine), eight replicates and two animals per experimental unit. The experimental diets and water were provided ad libitum throughout the experimental period. Digestible lysine levels did not change daily feed intake and carcass weight of the animals. Daily weight gain and feed conversion improved in a quadratic way up to the estimated levels of 0.803 and 0.871% of digestible lysine, respectively. It was observed an increasing linear effect of the treatments on daily lysine intake and amount of meat. Although daily meat deposition had increased in a linear way, the LRP was the model that best adjusted to the data which remained on a plateau from 0.803% of digestible lysine level. The levels of digestible lysine influenced the P2 backfat thickness of the animals which decreased in a linear way. The digestible lysine level of 0.803%, corresponding to an intake of 24.60 g/day of digestible lysine provides the best results of weight gain and meat deposition whereas the level of 0.817% corresponding to an intake of 25.30 g/day of lysine provides the best result of feed conversion, and the digestible lysine level of 0.948% corresponding to an intake of 29.09 g/day of digestible lysine provides the best results of meat deposition and backfat thickness of barrows from 95 to 125 kg. © 2011 Sociedade Brasileira de Zootecnia. Source


Saraiva A.,Federal University of Vicosa | Donzele J.L.,Federal University of Vicosa | de Oliveira R.F.M.,Federal University of Vicosa | de Abreu M.L.T.,DZO | And 3 more authors.
Revista Brasileira de Zootecnia | Year: 2011

With the objective to evaluate levels of available phosphorus (aP) in diets for pigs selected for meat deposition by maintaining the calcium and available phosphorus ratio, it was used 50 commercial hybrid female pigs with initial weight of 30.32 ± 0.29 kg, distributed in a complete randomized experimental design, with five treatments, five replicates, and two animals per experimental unit. Treatments were composed of a corn-soybean meal basal diet and four diets obtained by supplementation of basal diet with dicalcium phosphate, resulting in diets with 0.144; 0.224; 0.304; 0.384 and 0.464% of aP. Calcium levels were adjusted by varying the quantities of limestone in the diets. There was no effect of aP on both daily feed intake and feed conversion. Levels of aP affected daily weight gain which increased quadratically up to the estimated level of 0.372%. There was no effect of aP on quantity of phosphorus in the bones. The quantity of calcium in the bones and percentage of ash in the bones were influenced in an increasing linear way by the aP in the rations. The best result of weight gain of swine females, from 30 to 60 kg, genetically selected for meat deposition, is provided by the level of available phosphorus of 0.372%, which corresponds to a relationship with calcium of 2.06:1 and to a daily intake of 8.20 g of available phosphorus. © 2011 Sociedade Brasileira de Zootecnia. Source


Batista R.M.,Federal University of Vicosa | de Oliveira R.F.M.,Federal University of Vicosa | Donzele J.L.,Federal University of Vicosa | de Oliveira W.P.,Federal University of Vicosa | And 2 more authors.
Revista Brasileira de Zootecnia | Year: 2011

This study was conducted to evaluate levels of digestible lysine for pigs at 30 to 60 kg kept under heat stress. It was used 70 castrated animals kept in environment at 30°C and others 70 kept at 34°C, distributed in a randomized block design, with five treatments (0.83, 0.93, 1.03, 1.13 and 1.23% digestible lysine), and seven repetitions with two animals per experimental unit. The daily weight gain of the animals kept at 30°C increased up to 1.04% of digestible lysine, whereas it did not change at 34°C. Feed daily intake of animals at 30°C and 34°C did not change with levels of lysine. Daily lysine intake of animals, in both environments, increased according to the level of lysine in the diet. At 30°C, feed conversion improved up to the level of 1.07% lysine, whereas at 34°C, it did not vary among lysine levels. Regardless of the temperature, use efficiency of lysine decreased as levels of lysine increased and it was 4.4% worse in the environment with higher temperature. Protein deposition in carcass in the 30°C environment increased up to the level of 1.05% lysine, but it did not change at 34°C. At 30°C, fat deposition decreased down to 1.08% lysine, whereas in the 34°C environment, it increased up to 1.08%, and it was on average 25.6% lower than at 30°C. Levels of triiodothyronine and thyroxine were 35 and 30%, respectively, which was lower in animals kept in the 34°C environment, where respiratory rate and rectal temperature were higher than those observed in animals kept in the environment at 30°C. The levels of 1.04 and 0.83% of digestible lysine provide greater weight gain and protein deposition in pigs kept in environments at 30°C and 34°C, respectively. © 2011 Sociedade Brasileira de Zootecnia. Source

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