caa a22 4500 388060379 CHVBK 20180307125119.0 cr unu---uuuuu 161130e199808 xx s 000 0 eng 10.1017/S1357729800009796 doi S1357729800009796 pii (NATIONALLICENCE)cambridge-10.1017/S1357729800009796 The effect of host diet on the gas production profile of hay and high-temperature dried grass [Elektronische Daten] One of the sources of variation in the in vitro gas production (GP) technique is the inoculum source that is used and this could be greatly affected by the diet that is given to the donor animal. To study the effect of the host diet on the gas production profiles of grass hay and high temperature dried grass, two cows were offered either a silage: barley diet (80:20 dry-matter (DM) basis; GSB) or barley straw (ad libitum; STR). An adaptation period of 3 weeks was used and each animal experienced each diet type twice. Rumen fluid and solids were collected at the end of each 3-week period and used to inoculate the substrate cultures. The volume of gas produced (mllg DM) was 379 and 289 for GSB and STR respectively; gas yield (mllg organic matter degraded) was 442 and 411. The maximum fractional rates of degradation (per h) were 0·067 and 0·061 and the time (h) taken to reach these rates were 5·3 and 12·6. None of these differences was significant. There were also no significant differences in the concentration of total volatile fatty acids (VFA) in the final incubation media, or in the molar proportions of individual VFA. These results suggest that the fermentation stoichiometry was not affected by donor animal diet and, while microbial activity from STR was lower, this did not significantly affect the GP profile. The difference in microbial activity between the two diets was perhaps minimized by taking the sample of rumen contents before the morning meal. Copyright © British Society of Animal Science 1998 diet nationallicence gas production nationallicence in vitro nationallicence ruminants nationallicence Huntington J. A. ADAS Feed Evaluation and Nutritional Sciences, Drayton, Alcester Road, Stratford-upon-Avon CV37 9RQ Rymer C. ADAS Feed Evaluation and Nutritional Sciences, Drayton, Alcester Road, Stratford-upon-Avon CV37 9RQ Givens D. I. ADAS Feed Evaluation and Nutritional Sciences, Drayton, Alcester Road, Stratford-upon-Avon CV37 9RQ Animal Science Cambridge University Press 67/1(1998-08), 59-64 1357-7298 67:1<59 1998 67 ASC https://doi.org/10.1017/S1357729800009796 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S1357729800009796 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Huntington J. A. ADAS Feed Evaluation and Nutritional Sciences, Drayton, Alcester Road, Stratford-upon-Avon CV37 9RQ NATIONALLICENCE 700 1- Rymer C. ADAS Feed Evaluation and Nutritional Sciences, Drayton, Alcester Road, Stratford-upon-Avon CV37 9RQ NATIONALLICENCE 700 1- Givens D. I. ADAS Feed Evaluation and Nutritional Sciences, Drayton, Alcester Road, Stratford-upon-Avon CV37 9RQ NATIONALLICENCE 773 0- Animal Science Cambridge University Press 67/1(1998-08), 59-64 1357-7298 67:1<59 1998 67 ASC CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge