caa a22 4500 386320020 CHVBK 20180307111622.0 cr unu---uuuuu 161130e198810 xx s 000 0 eng 10.1017/S0003356100003329 doi S0003356100003329 pii (NATIONALLICENCE)cambridge-10.1017/S0003356100003329 Steen R. W. J. Agricultural Research Institute of Northern Ireland, Hillsborough, Co. Down The effect of additive treatment of grass silage and the food additive avoparcin on the response of calves to supplementation of silage-based diets with fish meal [Elektronische Daten] [R. W. J. Steen] Two experiments have been carried out to examine the effects of the fermentation quality of grass silage and the inclusion of avoparcin in the diet on the response in the performance of calves to supplementation of silage-based diets with fish meal. The eight treatments used in each experiment consisted of untreated and formic acid-treated (2·5 1/t) silages offered ad libitum and supplemented with either barley (B) or a barley/fish meal (BF) concentrate (200 g fish meal per kg), without or with 150 mg avoparcin per head daily in a 2 × 2 × 2 factorial design. All animals received 1·25 and 1·0 kg concentrates per head daily in experiments 1 and 2 respectively. In each experiment, the diets were offered to 40 castrated male cattle which were initially 126 and 110 kg live weight in experiments 1 and 2 respectively. On average over the two experiments the untreated and formic acid-treated silages contained 24·8 and 24·5 g nitrogen (N) per kg dry matter (DM); 475 and 571 g protein N per kg total N; 76 and 62 g ammonia-N per kg total N and 45-9 and 27·5 g volatile fatty acids per kg DM respectively. Silage DM intakes for the untreated silages supplemented with B and BF and the acid-treated silages supplemented with B and BF without avoparcin and for the untreated silages supplemented with B and BF and the acid-treated silages supplemented with B and BF with avoparcin were 3·0, 3·2, 3·2, 3·0, 2·9, 3·0, 3·0 and 3·2 (s.e. 0·16) kg/day respectively. Live-weight gains for the corresponding treatments were 0·97, 1·12, 0·98, 1·01, 1·00, 1·07, 1·10 and 1·13 (s.e. 0·032) kg/day respectively. It is concluded that the inclusion of fish meal in diets based on well preserved, grass silage and barley did not affect intake and produced a small response (70 g/day) in the live-weight gain of calves. The inclusion of avoparcin in the diet did not significantly affect the response to fish meal. Copyright © British Society of Animal Science 1988 Animal Production Cambridge University Press 47/2(1988-10), 245-252 0003-3561 47:2<245 1988 47 ASC https://doi.org/10.1017/S0003356100003329 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0003356100003329 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Steen R. W. J. Agricultural Research Institute of Northern Ireland, Hillsborough, Co. Down NATIONALLICENCE 773 0- Animal Production Cambridge University Press 47/2(1988-10), 245-252 0003-3561 47:2<245 1988 47 ASC CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge