Exigência líquida de zinco, cobre e ferro para cordeiros em pastejo no semiárido

ABSTRACT. It was evaluated the intake behavior of Nellore steers in system without shade (WS), and silvopastoral system (SP) maintained in star grass (Cynodon plectostachyus) in summer and winter. Twentyfour Nellore steers were used (12 in each system), mean age 18 months and weight of 294.5 kg. The design was completely randomized with two seasons, two treatments, 24 hours and 12 repetitions. The observations were conducted in three days, for 24 hours, with an interval of 15 minutes, with effect of the hour on the grazing behavior (GRAZ) with a maximum of 52.1% and lying ruminating (LYRUM) with a minimum of 12.3%, both at 14h. The lying idle (LYIDL) was influenced by hour with a minimum of 11,6%at 14h, and by season, with 23.9% in summer, and 13.9%, in winter. However, the standing ruminating (STRUM), without effect of hour, was affected by the interaction of season x system in summer (9.43%) and (6.19%), and winter (4.36%) and (8.27%), respectively, for SP and WS. Standing idle (OCEMP) was influenced by hour, with maximum 15.8% at 14h, and an interaction of system x season, in summer (20.10%) and (8.82%); and winter (9.05%) and (8.44%), respectively, for SP and WS. The SP system has changed the environment that affected the animal intake behavior.Keywords: welfare, season, Nelore, shadow.Comportamento de bovinos de corte e o microclima em sistema com e sem sombra RESUMO. Avaliou-se o comportamento ingestivo de novilhos anelorados, em sistema sem sombra (SS), e em sistema silvipastoril (SP) mantidos em grama estrela (Cynodon plectostachyus) no verão e inverno. Foram utilizados 24 novilhos anelorados (12 em cada sistema), com média de 18 meses e peso de 294,5 kg. O delineamento foi inteiramente casualizado com duas estações, dois tratamentos, 24h e 12 repetições. As observações foram realizadas em três dias, durante 24h, com intervalo de 15 min., com efeito da hora para os comportamentos pastando (PAST) com máxima de 52,1% e ruminando deitado (RUDEIT) com mínima de 12,3%, ambos às 14h. O ócio deitado (OCDEIT) foi influenciado pela hora e estação, em que nas horas com mínima de 11,6% às 14h enquanto no verão (23,9%) e inverno (13,9%). Ruminando em pé (RUEMP), sem efeito da hora, porém sofreu interação estação x sistema, no verão (9,43%) e (6,19%); e inverno (4,36%) e (8,27%), respectivamente, para SP e SS. O ócio em pé (OCEMP) sofreu efeito da hora, com máxima de 15,8% às 14h, e interação estação x sistema, no verão (20,10%) e (8,82%); e inverno (9,05%) e (8,44%), respectivamente, para SP e SS. O sistema SP alterou o ambiente afetando o comportamento ingestivo animal.Palavras-chave: bem-estar, estação do ano, Nelore, sombra.

show abstract

Performance of confined and grazing lambs fed diets with different mineral-concentrate supplements

Silva

Bezerra

Rufino

et al. 2014

Cienc. Inv. Agr.

View full text Add to dashboard Cite

For confined animals, performance is improved when their diet is supplemented with a mineral mixture and protein energy. This study evaluated the effect of dietary supplementation on feedlot sheep on native pasture. Two experiments were conducted in sequence, with the animals constrained in one and animals confined to pasture in the other. The experiments were conducted with 32 Santa Ines lambs, with average initial weights of 16.8 and 19.9 kg for the constrained and pasture studies, respectively. In both experiments, the animals were offered the following supplements: Supplement 1 = 200 g of the concentrate without mineral mixture; Supplement 2 = 200 g of the concentrate with mineral mixture + Mn + Zn; Supplement 3 = 300 g of the concentrate with mineral mixture + Mn + Zn; and Supplement 4: 300 g of the concentrate with mineral mixture + Zn without Mn. The intake of the mineral mixture resulted in a higher average intake of crude protein in feedlot lambs and neutral detergent fiber in pasture lambs than the other diets, regardless of the presence of manganese and thus provided more consistent weight gain among the animals. The mineral mixture supplementation increased the average daily intake of Zn and Mn. The animals on the diets containing 300 g day -1 supplementation with the concentrated mineral mixture also had more weight gain and better feed conversion than those on the other diets, most likely because of the greater responsiveness to supplementation in these animals.

show abstract

Exigência líquida de zinco, cobre e ferro para cordeiros em pastejo no semiárido

Cited by 3 publications

References 4 publications

Carcass characteristics of Santa Inês lambs finished on native pasture and subjected to different types of supplementation

Carcass characteristics of Santa Inês lambs finished on native pasture and subjected to different types of supplementation

Behavior of beef cattle and the microclimate with and without shade

Performance of confined and grazing lambs fed diets with different mineral-concentrate supplements

Contact Info

Product

Resources

About