Micromineral nutritional requirements for weight gain in Canindé goats under grazing in the brazilian semiarid

Abstract

ABSTRACT. The purpose was to estimate the liquid requirements of Zn, Fe, Mn and Cu for weight gain in 46 castrated Canindé goats in grazing system in the Caatinga supplemented with 0, 0.5, 1 and 1.5% levels in relation to live weight. The animals had an initial average body weight of 15.76 ± 0.96 kg. Six animals were slaughtered at the onset of the experiment (16.1 ± 1.15 kg BW) and the rest (n = 40) were randomly distributed into one of the four levels of supplementation. The body composition (mg kg Exigências nutricionais de microminerais para ganho em peso de caprinos Canindé em pastejo no semiárido brasileiro RESUMO. Objetivou-se estimar as exigências líquidas de Zn, Fe, Mn e Cu para ganho em peso de 46 caprinos castrados da raça Canindé suplementados com níveis de 0; 0,5; 1; e 1,5% em relação ao peso vivo em sistema de pastejo na Caatinga. Os animais apresentaram peso corporal inicial médio de 15,76 ± 0,96 kg. Seis animais foram abatidos no início do experimento (16,1 ± 1,15 kg PV) e o restante (n = 40) foi distribuído aleatoriamente para um dos quatro níveis de suplementação. A composição corporal (mg kg -1 PCV) variou de 8,47 a 9,09 mg de Zn (não seria mg de Zn); 13,54 a 13,77 mg de Fe; 6,34 a 6,36 mg de Mn e 3,78 a 5,10 mg de Cu, para caprinos Canindé de 15 e 25 kg PV, respectivamente e as exigências líquidas para ganho (mg kg -1 PV ganho) foram estimadas pelo método do abate comparativo as quais variam de 6,98 a 7,77 mg de Zn; 10,20 a 10,72 mg de Fe; 4,64 a 4,82 mg de Mn; e 4,28 a 5,96 mg de Cu para os animais com PV variando de 15 a25 kg, respectivamente. As exigências líquidas em microminerais estimadas nesta pesquisa foram inferiores às recomendações feitas pelos comitês internacionais.Palavras-chave: composição corporal, animais nativos, elementos traços, suplementação.

The net iron, manganese, copper, and zinc requirements for maintenance and growth of Dorper × Hu ewe lambs

“…EBW, ADG, and EBW gain (EBWG) increased as intake level increased, which was according to the report by Zhang et al (2015). Similar results were also reported by Silva et al (2013), who showed that the EBW and EBWG of Canind e goats with BW varying from 15 to 25 kg increased as feed intake level increased. In our study, for Dorper  Hu ewe lambs, Fe, Mn, Cu, and Zn concentrations in the EBW slightly decreased as intake level increased.…”

Trace mineral requirements for growth of Moxotó goats grazing in the semiarid region of Brazil

“…Similar results were reported by Silva et al (2013), who showed that the EBW, EBWG, and trace element content of Canindé goats with BW varying from 15 to 25 kg increased as feed intake level increased. In this study, we found that when the Zn, Fe, Cu, and Co contents were expressed based on the metabolic weight (mg/kg 0.75 of EBW) (Table 3), a linear increase was observed in response to the increased level of supplementation.…”

“…Net iron requirements in this study (42.45 to 59.03 mg of Fe/BW gain) were similar to those recommended by NRC (2007) for growing sheep (55 mg of Fe/kg of BW gain) and to those found by Zang et al (2015) for males (56.60 to 49.40 mg of Fe/BW gain); however; they were greater than those observed for females (24.70 to 17.60 mg of Fe/BW gain). In our study, all the net requirements for growth were higher than those observed by Silva et al (2013) working with animals in similar conditions to those of this study. According to Zang et al (2015), these differences might be related, in part, to breed, feed, management practices, and physiological and environmental conditions.…”

“…This concentration pattern may have been a reflection of the increased mineral intake and weight gain, which led to a better body development of the animals as the increase in BW has been noted as one of the main discriminating factors in body composition (Mahgoub and Lu, 1998;Bellof and Pallauf, 2007;Fernandes et al, 2007;Araújo et al, 2010;Fernandes et al, 2012;Teixeira et al, 2013). Silva et al (2013) observed that trace element concentrations in the empty body of Canindé goats increased as feed intake levels increased. In lambs, Bellof and Pallauf (2007) observed a similar concentration pattern to the one presented in this study, reporting that the concentration of Zn and Mn increased during the growing period and there was a decrease in the concentration of Fe and Cu as BW increased.…”

“…Studies have also demonstrated that the retention of trace elements (mg/kg of EBWG) is influenced by the nutrition plan, sex, and final body weight (Bellof and Pallauf, 2007;Ji, et al, 2014;Silva et al, 2013;Zhang et al, 2015). Ji et al (2014) observed that concentrations of zinc ranged from 29 to 30 mg/kg EBWG for ram lambs and 29 to 28 mg/kg EBW for ewe lambs, which were slightly (b−1) , in which constants a and b were determined from the equations in Table 4.…”