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Ingestive behavior of feedlot finished young bulls fed different concentrate levels in the diet R. Bras. Zootec.
Missio,Regis Luis; Brondani,Ivan Luiz; Alves Filho,Dari Celestino; Silveira,Magali Floriano da; Freitas,Leandro da Silva; Restle,João.
This study was developed to evaluate the ingestive behavior of beef cattle finished in feedlots with different concentrate levels in the diet. Sixteen bulls fed 22, 40, 59, or 79% of concentrate in the diet were assigned to a complete randomized design, with four replicates each. The supplied diets were isoproteic and the roughage used was corn silage. Data collection was carried out during the finishing period, with a total of six days. The time given to food intake, rumination, the number of bouts per meal and neutral detergent fiber rumination efficiency decreased linearly as the concentrate levels in the diet increased. Idle time increased linearly accordingly to the increment of concentrate in the diet. The animals have greater feed intake and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Corn silage; Feeding time; Food efficiency; Idle; Rumination.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000700025
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Toxicity of ammonia to turbot juveniles: I. effects oil survival, growth and food utilisation ArchiMer
Person-le Ruyet, Jeannine; Delbard, Christine; Chartois, Herve; Le Delliou, Herve.
Long-term effects of constant exogenous ammonia concentrations were investigated in two different batches of turbot juveniles (53 and 73 g) under controlled environmental and feeding conditions. Over the 84-day experiments, ambient un-ionized ammonia (UIA-N, NH3) concentrations were steady (coefficient of variation, 12-16 %) and water pH range was 7.88-7.99. Survival was maximum up to 0.33 mg.l(-1) UIA-N and at 0.73, 50 % mortalities were observed on day 52 (73 g) or day 77 (53 g). No-growth concentration was 0.73 mg.l(-1) UIA-N in the two groups and the 84-day lowest-observable-effect concentration range 0.14-0.33 mg.l(-1). In the most tolerant group (53 g), the 84-day no-observable-effect concentration was 0.14 mg.l(-1) UIA-N. The estimated 28-day...
Tipo: Text Palavras-chave: Azote ammoniacal; Toxicité chronique; Taux de survie; Croissance; Alimentation; Ammonia; Chronic toxicity; Survival rate; Growth; Food efficiency; Psetta maxima.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/00188/29882/28354.pdf
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