Efeito de níveis de suplementação sobre o comportamento ingestivo de bezerras em pastagem de aveia (Avena strigosa Schreb.) e azevém (Lolium multiflorum Lam.)

Abstract

Foi avaliado o comportamento ingestivo de bezerras de corte submetidas a diferentes níveis de suplementação energética. Os níveis testados foram (0; 0,5; 1,0; 1,5% do peso vivo), em pastagem de aveia preta (Avena strigosa Schreb.) e azevém (Lolium multiflorum Lam.). O suplemento foi farelo de trigo, fornecido diariamente às 14h. Para registro das atividades de pastejo, ruminação, ócio e permanência no cocho, adotou-se a observação visual, feita a cada dez minutos, durante 24 horas, em quatro datas. Para cada nível de suplementação, foram observados seis animais dos grupos genéticos Charolês, 3/4 Charolês/Nelore e 5/8 Nelore/Charolês, com aproximadamente oito meses de idade e peso inicial de 158 kg. Os animais que receberam suplementação diminuíram o tempo de pastejo em relação aos não-suplementados, sem alteração no consumo estimado de forragem. Os animais que receberam suplementação a 1,5% do PV permaneceram mais tempo no cocho, aumentando a freqüência de retorno ao cocho nos maiores níveis de suplementação. Os níveis de suplementação não interferiram nos tempos de ruminação e ócio.

Maize supplementation of Pelibuey sheep in a silvopastoral system: fodder selection, nutrient intake and resilience against gastrointestinal nematodes

“…The reduction suggests that supplemented lambs were eating less fodder when grazing in the paddock, waiting to eat the whole supplement offered after grazing. This reduction is similar to the substitution effect reported for supplemented heifers (Bremm et al, 2005) and dairy cows (Bargo et al, 2003). These authors reported greater rates of substitution especially when supplementation was increased.…”

“…The reduction of fodder intake, resulting from different supplementation levels and types of supplements in the diet (Krysl and Hess, 1993;Bremm et al, 2005), might reduce the ingestion of infective larvae from pasture. Parasitism may also modify the animal's diet selection to compensate for the loss of endogenous protein through a change in feed-type selection (i.e.…”

Canopy characteristics and behavior of Nellore heifers in Brachiaria brizantha pastures under different grazing heights at a continuous stocking rate

“…According to Bremm et al (2005), when working with heifers, grazing time is reduced when the animals receive energy-protein supplementation. According to these authors, the reduction in grazing time is the result of more time spent at the trough, which increases with the amount of supplement provided.…”

Ingestive behavior and displacement patterns of beef heifers on Italian ryegrass pasture

“…The grazing time was lower for supplemented heifers in the first and third assessments. It has been suggested that grazing time decreases for supplemented heifers on oats and ryegrass pasture (Bremm et al, 2005;Macari et al, 2007). Also, in the first assessment there was no difference for rumination time between supplemented heifers and those exclusively on pasture.…”

“…Supplementation reduces grazing time of animals in relation to non-supplemented ones, without changing their forage intake (Bremm et al, 2005). Increased levels of supplement for beef heifers causes a decrease in grazing time and an increase in idle time.…”