科研之友
微信
新浪微博
Facebook
分享链接
摘要
Este trabalho teve por objetivo determinar as exig那ncias l赤quidas de zinco (Zn), cobre (Cu) e ferro (Fe) de cordeiros Santa In那s em pastejo na regi o semi芍rida. Os animais com peso vivo entre 20 e 30 kg apresentaram conte迆do corporal no peso de corpo vazio (PCV) para esses minerais de 60,26 a 76,37 mg kg-1, 10,78 a 16,72 mg kg-1 e 133,44 a 126,98 mg kg-1, respectivamente. Observou-se que com o aumento do PCV, as concentra es de Cu e Zn tamb谷m aumentavam, enquanto a de Fe diminu赤a. As exig那ncias l赤quidas para cordeiros em regime de pastejo variaram de 1,69 a 7,86 mg dia-1 para Cu e 7,20 a 27,4 mg dia-1 para Zn. Os resultados obtidos no presente trabalho, para exig那ncias desses minerais, foram maiores do que as exig那ncias diet谷ticas recomendadas pelo do NRC (1985), que s o de 7 a 11 mg, com m芍ximo de 25 mg e de 20 a 30 mg, com m芍ximo de 750 mg kg-1 de alimento, para Cu e Zn, respectivamente. As exig那ncias l赤quidas de Fe variaram de 8,46 a 26,66 mg dia-1, e portanto, menores do que as recomendadas pelo NRC (1985) para este mineral que s o de 30 a 50 mg kg-1 de alimento. This work had as an aim determine the net requirements of Zinc (Zn), Copper (Cu) and Iron (Fe) of Santa In那s lambs raised grazing in the semi-arid area. Animals with body weight between 20 e 30 kg showed corporea contents in empty body weight (EBW) in these minerals from 60.26 to 76.37 mg kg-1, 10.78 to 16.72 mg kg-1 and from 133.44 to126.98 mg kg-1, respectively. It was observed that increasing the PCV increased Cu and Zn concentration but decreased the Fe concentrati那son. The net requirements for lambs under pasture varied from 1.69 to 7.86 mg day-1 for Cu and from 7.20 to 27.4 mg day-1 for Zn. The results obtained in the present experiment suggest that the dietary requirements in Cu and Zn are higher than those recommended by NRC (1985), between 7 and 11 mg, with a maximum value of 25 mg for Cu and between 20 and 30 mg, with a maximum of 750 mg kg-1 of food for Zn, respectively. The net requirements for Fe varied from 8.46 to26.66 mg day-1 and were lower than that recommended by NRC (1985) for this mineral, from 30 to 50 mg kg-1 of diet.
