Dry matter intake and body condition score change of dairy cows grazing fodder beet, kale and kale-oat forage systems in winter

Abstract

Abstract Crop dry matter (DM) yield, DM utilisation and body condition score (BCS) of dairy cows were measured over two winters on an irrigated stony, free-draining Balmoral soil for three crop grazing systems: fodder beet (FB); early-sown kale (EK); and late-sown kale with oats grown in sequence (LK). There were two replicates of each treatment, with 35-58 cows per treatment group. Allocations of crop and supplements (kg DM/cow/day) were: FB, 8 kg fodder beet + 6 kg grass baleage; EK, 14 kg kale + 3 kg barley straw; LK, 11 kg kale + 5 kg green chop oat baleage. Pre-grazing crop DM yield (t DM/ha) was higher in FB (20.1) than EK (14.6) and LK (12.9). DM utilisation was high in all treatments averaging 99.6%, 90.5% and 87.1% for FB, EK and LK, respectively. Body condition score change over the 8-week winter-feeding period was similar for cows offered FB (+0.76), EK (+0.66) and LK (+0.76). Allocation of feed quantity is more important in determining BCS gain than the type of crop and supplement fed. Keywords: Brassica oleracea L., Beta vulgaris L., metabolisable energy