Metabolic problems of incorrect nutricional handling of high production calved dairy cows [Problemas metabólicos provenientes do manejo nutricional incorreto em vacas leiteiras de alta produção recém paridas]
Neto A.C.,Doutorando em Ciencia Animal |
Da Silva J.F.C.,LZNA CCTA UENF |
Deminicis B.B.,DZOO CCA UFES |
Fernandes A.M.,LZNA CCTA UENF |
And 3 more authors.
Revista Electronica de Veterinaria | Year: 2011
With increasing specialization of dairy production systems, the trend is an increased occurrence of metabolic diseases of order. The objective of this review was to address the higher incidence of metabolic diseases in highproducing cows reported in the literature, these being: ketosis-cetoce complex fatty liver, metabolic acidosis, hypocalcemia, and displaced abomasum. These diseases are prevalent in high-producing cows when the transition period extending from three weeks before until three weeks after birth and several factors predispose the occurrence of these and can quote the body condition score, dietary practices and stress condition of animal during this period. Although in some cases are not easy to diagnose such diseases can be prevented and treated. However, prevention based food management appropriate, shows up as the best strategy to be adopted.
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.