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Souza E.O.,Mestrando em Ciencia Animal | Haese D.,Medicina Veterinaria | Kill J.L.,Medicina Veterinaria | Haddade I.R.,IFES CST | And 4 more authors.
Revista Brasileira de Zootecnia | Year: 2011

In order evaluate digestible lysine levels in diets supplemented with 20 ppm of ractopamine on the performance and carcass traits, 64 barrows with high genetic potential at finishing phase were allotted in a completely randomized block design with four digestible lysine levels (0.80, 0.90, 1.00, and 1.10%), eight replicates and two pigs per experimental unit. Initial body weight and pigs' kinship were used as criteria in the blocks formation. Diets were mainly composed of corn and soybean meal supplemented with minerals, vitamins and amino acids to meet pigs' nutritional requirements at the finishing phase, except for digestible lysine. No effect of digestible lysine levels was observed in animal performance. The digestible lysine intake increased linearly by increasing the levels of digestible lysine in the diets. Carcass traits were not influenced by the dietary levels of digestible lysine. The level of 0.80% of digestible lysine in diets supplemented with 20 ppm ractopamine meets the nutritional requirements of castrated male pigs during the finishing phase. © 2011 Sociedade Brasileira de Zootecnia. Source

Mendonca P.P.,Doutorando em Ciencia Animal LZNA CCTA UENF | Vidal Junior M.V.,LZNA CCTA UENF | Polese M.F.,Mestrando em Ciencia Animal | dos Santos M.V.B.,Mestranda em Producao Animal | And 2 more authors.
Revista Brasileira de Zootecnia | Year: 2012

The experiment was performed with 160 tambaqui (Colossoma macropomum) with average weight 11.01±2.08 g and total length 7.8±0.18 cm. Fishes were kept in sixteen aquariums with 56 L of water at 29.1±0.4 oC of temperature, initial stocking density 1.97 g/L and constant aeration. The objective of this study was to assess the influence of photoperiod on fish performance. Treatments consisted of four photoperiods: T1 = 6 hours; T2 = 12 hours; T3 = 18 hours and T4 = 24 hours, with four replicates each. Fishes were fed twice a day with commercial extruded feed (28% of crude protein). The experiment was developed in closed circulation system, with volume of water renewal for each experimental unit equivalent to 40 times daily. Fish biometry was performed at the beginning of the experiment and at every 16 days, in order to follow the effects of treatments on juvenile development. Final weight, total length, standard length, height, feed intake, weight gain, feed conversion, survival, specific growth rate, protein efficiency rate and protein retention efficiency were assessed. Statistical analysis of variables was performed with application of the software SAEG version 9.1, for analysis of variance, regression analysis and Pearson correlation. Positive influence of photoperiod was observed for the studied variables in this study. The studied variables enhanced as the photoperiod increased, mainly between 15 and 22 hours. The photoperiod has significant influence upon growth traits of tambaqui (Colossoma macropomum). © 2012 Sociedade Brasileira de Zootecnia. Source

De Oliveira G.J.C.,CCAAB | Jaeger S.M.P.L.,CCAAB | Bagaldo A.R.,CCAAB | De Oliveira P.A.,Mestrando em Ciencia Animal
Revista Brasileira de Zootecnia | Year: 2010

The price of the products used for animal supplementation and the existence of a rich native flora of eudicotyledon forage, drove the idea for develop a technique feed supplementation aiming improve livestock yield levels in the semiarid zone. The fodder salt technique has been developed by the Tropical Zootechnical Rsearch Group at the Centro de Ciências Agrárias Ambientais e Biológicas da Universidade Federal do Recôncavo da Bahia (CCAAB/UFRB). Defined as a mixture of mineral salt and ground eudocotyledon forage hay, among them, some xerophitas species, the "fodder salt" consisting to a low cost technique with high applicability potential for ruminant production in semiarid environment. The salt controls consumption, for it facilitates the offer of eudicotyledon hay. When added to the mixture, it becomes salty, and the animals ingest it slowly and repeatedly. This behavior results in a reduction of feed intake, in less fighting among animals, and allows a better even distribution of feed for all of them. The researches on "fodder salt" have presented satisfactory responses of animal performance, and without doubt, this technique facilitates feed management and increases herd yield. © 2010 Sociedade Brasileira de Zootecnia. Source

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