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- W2041894993 abstract "We studied, over 1 month (mid-June to mid-July), the effects of a restriction of available daily grazing time on the diet choices of heifers between a vegetative sward (VS) and a reproductive sward (RS) evolving from the earing to the flowering stage. The aim was to mimic a situation of extensively exploited pastures where resource quality varies against availability (height). The VS was either tall (13.5 cm) or short (7.5 cm), and was crossed with the available daily grazing time (24 h versus 5 h per day) to form four treatments. Twenty 18-month-old Charolais heifers were divided into four groups of five, with each group allocated to one treatment throughout the experiment. The effects of the constraints (VS height and available grazing time) varied with RS maturity. At the earing stage, the heifers, as expected, increased their proportion of grazing time spent on RS as access time and/or VS height decreased. However, at the flowering stage heifers maintained their grazing time on VS as VS height decreased, and reduced the time spent on RS more than on VS as grazing time was restricted, more so as VS was shorter. Thus, they accentuated their preference for VS as available time decreased. To examine these choices in terms of trade-off between diet quality and total daily energy intake, we estimated total intake and diet digestibility. The VS height constraint affected neither total intake nor diet digestibility. The time constraint caused both total intake and diet quality to decline, and intake seemed to be more markedly affected than diet digestibility. When the available grazing time was limited, heifers, by spending more than 0.60 of this time grazing VS, probably ate less than they would have done by grazing longer on RS, which provided higher intake rates. This marked preference for grazing VS of high quality indicates that heifers prioritised quality over intake when faced with the proposed trade-off." @default.
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- W2041894993 date "2005-10-01" @default.
- W2041894993 modified "2023-09-26" @default.
- W2041894993 title "Constraining the time available to graze reinforces heifers’ preference for sward of high quality despite low availability" @default.
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- W2041894993 doi "https://doi.org/10.1016/j.applanim.2005.02.010" @default.
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