caa a22 4500 386320845 CHVBK 20180307111626.0 cr unu---uuuuu 161130e198808 xx s 000 0 eng 10.1017/S0003356100037028 doi S0003356100037028 pii (NATIONALLICENCE)cambridge-10.1017/S0003356100037028 Rapeseed meal in the diet of pubertal heifers during early pregnancy [Elektronische Daten] The response of Hereford × Friesian heifers to large intakes of two types of high glucosinolate rapeseed meal were studied during two 5-month periods in consecutive years. In year 1, six heifers were given a compound concentrate food containing 250 g/kg extracted rapeseed meal and six control animals were given concentrate containing 210 g/kg soya-bean meal. In year 2, a further six heifers were given concentrate containing 320 g/kg expeller rapeseed meal and six control animals were given the same soya-bean meal compound concentrate. The crude protein (CP): metabolizable energy (ME) ratio of all diets was 14·3 g CP per MJ ME. Barley straw was the only roughage offered. There were no differences between groups in ovarian activity assessed from plasma progesterone concentrations, nor in behavioural activity around oestrus. The heifers were slaughtered 6 weeks after artificial insemination. Pregnancy rate was proportionally 0·58 (7/12) in the rape-fed and 0·67 (8/12) in the control heifers (P > 0·05). Foetuses from heifers given rapeseed meal were slightly smaller than those from control heifers; the difference was significant in year 2 (P < 0·05). Thyroid glands of heifers given rapeseed meal showed histological evidence of goitrogenicity but weights of the glands did not reflect this. Plasma thyroxine values were depressed in heifers given rapeseed meal (year 1, P < 0·001; year 2, P < 0·05). Plasma thiocyanate was elevated in rapeseed meal heifers in both years (P < 0·001) compared with values for control animals. Copyright © British Society of Animal Science 1988 Vincent Isobel C. Department of Veterinary Medicine and Animal Husbandry, The Royal Veterinary College, Boltons Park, Potters Bar, Hertfordshire EN6 1NB Hill R. Department of Veterinary Medicine and Animal Husbandry, The Royal Veterinary College, Boltons Park, Potters Bar, Hertfordshire EN6 1NB Williams H. Ll Department of Veterinary Medicine and Animal Husbandry, The Royal Veterinary College, Boltons Park, Potters Bar, Hertfordshire EN6 1NB Animal Production Cambridge University Press 47/1(1988-08), 39-44 0003-3561 47:1<39 1988 47 ASC https://doi.org/10.1017/S0003356100037028 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0003356100037028 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Vincent Isobel C. Department of Veterinary Medicine and Animal Husbandry, The Royal Veterinary College, Boltons Park, Potters Bar, Hertfordshire EN6 1NB NATIONALLICENCE 700 1- Hill R. Department of Veterinary Medicine and Animal Husbandry, The Royal Veterinary College, Boltons Park, Potters Bar, Hertfordshire EN6 1NB NATIONALLICENCE 700 1- Williams H. Ll Department of Veterinary Medicine and Animal Husbandry, The Royal Veterinary College, Boltons Park, Potters Bar, Hertfordshire EN6 1NB NATIONALLICENCE 773 0- Animal Production Cambridge University Press 47/1(1988-08), 39-44 0003-3561 47:1<39 1988 47 ASC CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge