Abstract
A 2 ×2 factorial design experiment with 32 spring-calving Hereford-Ayrshire and 31 Limousine-Ayrshire suckler cows was conducted to compare the effects of diets based on hay (H)or urea-treated straw (US)at two feeding levels (moderatekg/day from day 30 to 0 pre partum Post partum cows received 3.0 kg/day of the same mixture. All cows were in calf to Charolais sires. During the mating period, cows were inseminated after oestrus synchronisation and subsequently exposed to a bull. Average daily intakes of the cows were on treatment MH 9.1 kg DM/day and 77.4 MJ metabolizable energy (ME), on treatment MUS 8.5 kg DM and 67.2 MJ ME,on treatment LH 6.9 kg DM and 58.9 MJ ME and on treatment LUS 6.7 kg DM and 53.7 MJ ME, respectively. Live weight gain (LWG) during the indoor feeding was lower (P
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