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| Almeida,VR; Dias,AN; Bueno,CFD; Couto,FAP; Rodrigues,PA; Nogueira,WCL; Faria Filho,DE. |
| The objective of the present study was to evaluate the effects of different dietary crude protein (CP) and metabolizable energy (ME) levels on the performance, internal and external egg quality, and cloacal temperature of commercial layers reared in hot climate. In this trial, 100 commercial Hy-Line W-36 layers between 20 and 32 weeks of age were distributed according to a completely randomized experimental design with a 2 x 2 factorial arrangement, consisting of two CP levels (15 e 18%) and two ME contents (2700 and 3100 kcal/kg) with five replicates per treatment and 10 birds per replicate. Performance (feed intake, egg production, egg mass, and feed conversion ratio), internal (Haugh units and albumen and yolk percentage) and external (eggshell % and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Thermal homeostasis; Nutrition; Environmental temperature; Cloacal temperature. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2012000300007 |
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| Sgavioli,S; Santos,ET; Domingues,CHF; Quadros,TCO; Castiblanco,DMC; Andrade-Garcia,GM; Amoroso,L; Nääs,IA; Garcia,RG; Baraldi-Artoni,SM. |
| ABSTRACT Adequate environmental temperature control is essential for incubation efficiency. Layer breeder eggs (n=360) were weighed and distributed in a completely randomized experimental design with two treatments, consisting of two incubation temperatures (T1=37.5 °C, control; and T2=39.0 °C, hot), with two incubators per temperature, and 90 eggs per incubator, totaling 360 eggs. Hatchability, embryo mortality, and chick cloacal and body surface temperatures were not affected by incubation temperature. Eggs incubated at the hot temperature presented greater egg mass loss and higher eggshell conductance than those incubated at the control temperature. Layer chicks derived from eggs incubated at control temperature showed greater absolute weight, yolk-free... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Body weight; Cloacal temperature; Conductance; Hatchability; Loss of mass. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2016000600041 |
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| Mazzi,C.M.; Ferro,M.I.T.; Coelho,A.A.D.; Savino,V.J.M.; Macari,M.; Ferro,J.A.; Givisiez,P.E.N.; Giachetto,P.F.; Silva,M.M.; Dionello,N.J.L.. |
| The variation in cloacal temperature, body weight loss and expression of the 70 kDa heat shock protein (Hsp70) in three naked neck broiler genotypes during heat stress were studied. Twelve birds of each genotype (Na/Na, Na/na and na/na) were reared to market weight (approximately 2.1kg) at thermoneutral temperature. Six birds from each group served as controls and the remaining six underwent gradual heat stress (from 28ºC to 36ºC). Cloacal temperature and body weight were measured before and after exposure to heat. Liver samples were collected and Hsp70 levels were quantified using western blotting with monoclonal anti-chicken Hsp70 antibody. Heterozygous (Na/na) birds had a significantly lower cloacal temperature variation and less body weight loss during... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Broiler chicken; Naked neck genotype; Hsp70 expression; Heat stress; Cloacal temperature. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352002000100006 |
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