Comportamento ingestivo diurno de vacas primíparas em pastagem nativa dominada por capim-annoni-2 com suplementação proteica e mineral em diversas estações climáticas

Abstract

RESUMO -Avaliou-se a influência da suplementação proteica e mineral sobre o comportamento ingestivo de vacas primíparas em pastagem nativa dominada por capim-annoni-2 (Eragrostis plana Ness) recebendo suplementação com sal comum; sal mineral; sal proteinado; ou sal para reprodução e sal proteinado (1:1). Testou-se a hipótese de que suplementos minerais e proteinados pudessem promover alterações no comportamento ingestivo dos animais em pastejo. O estudo foi desenvolvido em uma área de 37 ha de pastagem nativa invadida por capim-annoni-2, dividida em oito potreiros (unidades experimentais did not differ among supplements, and the average daily values for these activities were 505, 108, 70 and 11 min., respectively.The grazing time, ruminating, idling and bite rate differed significantly among the climatic seasons. Protein salt and mineral salt supplementation does not promote significant changes in the animals ingestive behavior. The ingestive behavior is, however, influenced by the climatic seasons.

Timing and Duration of Observation Periods of Foraging Behavior in Natural Grasslands

“…For example, ruminants commonly have grazing times between 450 and 600 min/day in temperate pastures and rarely forage <360 min/day, with times that may exceed 760 min/day on subtropical and tropical pastures ( 4 , 5 ). In the southern Brazil Campos grasslands ( 6 ), without limitations to inhibit potential intake (e.g., sward height or herbage mass), the time spent grazing commonly ranges between 500 and 650 min/day ( 7 – 9 ), regardless of the grazing method used ( 10 ). This variation in grazing time indicates potentially diverse situations and challenges that animals can face, even in situations with abundant forage allowance, attesting to the complex interaction of animals with plants and sward structure.…”

Ingestive behavior and movement patterns of steers grazing sorghum and supplemented with concentrate

“…Similarly, Rodrigues et al (2019) found that the time spent by heifers grazing sorghum and eating the feed supplement in the trough was 401 and 39 min day -1 , respectively. The direct correlation between feeding and the ingestion of cell wall justifies the small differences in average forage NDF (643.57 g kg -1 of dry matter [DM]) and average forage DM between treatments (Table 1) (Carlotto et al, 2010). It is of note that a study found that concentrate intake was negatively correlated with rumination time (Pizzuti et al, 2012;Santana et al, 2012), and the latter was not correlated with weight gain and feed conversion (Santana et al, 2013).…”

Mineral, Protein, and Energy Supplementation in Heifers in a Native Pampa Biome Pasture During Winter

“…It is believed that the absence of positive weight gain of heifers due to supplementation is related to lowquality pasture and high infestation of tough lovegrass. Carlotto et al (2010), when researching the influence of protein and mineral supplementation on the ingestive behavior of primiparous cows in a native pasture dominated by tough lovegrass, found that supplementation had no effect on grazing, rumination, idleness, and other activities. The dominance of tough lovegrass and the uniformity of the forage mass during the experiment period caused the animals to spend most of the day in grazing activity due to the high fiber content and the difficulty of digesting this material.…”