Proceedings
Many experiments suggest that ruminants can regulate energy intake, presumably by a negative feedback system. A case has been made for volatile fatty acids (VFA) as feedback signals. However, in most studies VFA were administered during meals whereas absorption of VFA produced in response to a meal takes place over a period of hours. Therefore, this study examines the effect of voluntary feed intake and rumen fluid VFA of continuous infusions of VFA into yhe rumen during a 5 hour periods. Four adult female goats, fed ad libitum a pelleted feed (0.5 barley : 0.5 dried grass), provided with rumen cannulae, were used to infuse VFA, neutralized with NaOH to pH 4.5-5.5, at a rate of 3.3 ml/min. Acetate, propionate and n-butyrate, separately or as a mixture, were infused at a low and a high rate; NaCl solutions served as controls. Feeding behavior was recorded continuously. Neither propionate (14 and 28 umol/kg/min) non n-butyrate (7 and 14 umol/kg/min) affected 5 h feed intake in spite of large increases of these acids in the rumen fluid. In contrast, acetate depressed 5 h feed intake by 52 percent at the high rate (91 umol/kg/min) and by 22 percent at the low rate (45 umol/kg/min). However, in both cases ruminal acetate rose to very high levels. The mixture of VFA at the low rate did not affect 5 h feed intake whereas the high rate depressed feed intake by 37 percent but the latter infusion resulted in high rumen fluid VFA levels. It is concluded that propionate and n-butyrate do not control feeding behavior whereas a role of acetate as regulator of feed intake, as suggested in the literature, is doubtful in ad libitum fed goats
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Scottsdale, AZ (EUA)
1982
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| Subjects: | CAPRINOS, ALIMENTACION DE LOS ANIMALES, CONSUMO DE ALIMENTOS, CONSUMO VOLUNTARIO, ENERGIA, ACIDOS GRASOS VOLATILES, HOLANDA, |
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KOHA-OAI-BVE:441082020-02-03T21:07:39ZProceedings 61549 De Jong, A. 6757 Dairy Goat Journal Publishing Co., Scottsdale, AZ (EUA) 33022 3. International Conference on Goat Production and Disease Tucson, AZ (EUA) 10-15 Ene 1982 Scottsdale, AZ (EUA)1982Many experiments suggest that ruminants can regulate energy intake, presumably by a negative feedback system. A case has been made for volatile fatty acids (VFA) as feedback signals. However, in most studies VFA were administered during meals whereas absorption of VFA produced in response to a meal takes place over a period of hours. Therefore, this study examines the effect of voluntary feed intake and rumen fluid VFA of continuous infusions of VFA into yhe rumen during a 5 hour periods. Four adult female goats, fed ad libitum a pelleted feed (0.5 barley : 0.5 dried grass), provided with rumen cannulae, were used to infuse VFA, neutralized with NaOH to pH 4.5-5.5, at a rate of 3.3 ml/min. Acetate, propionate and n-butyrate, separately or as a mixture, were infused at a low and a high rate; NaCl solutions served as controls. Feeding behavior was recorded continuously. Neither propionate (14 and 28 umol/kg/min) non n-butyrate (7 and 14 umol/kg/min) affected 5 h feed intake in spite of large increases of these acids in the rumen fluid. In contrast, acetate depressed 5 h feed intake by 52 percent at the high rate (91 umol/kg/min) and by 22 percent at the low rate (45 umol/kg/min). However, in both cases ruminal acetate rose to very high levels. The mixture of VFA at the low rate did not affect 5 h feed intake whereas the high rate depressed feed intake by 37 percent but the latter infusion resulted in high rumen fluid VFA levels. It is concluded that propionate and n-butyrate do not control feeding behavior whereas a role of acetate as regulator of feed intake, as suggested in the literature, is doubtful in ad libitum fed goatsMany experiments suggest that ruminants can regulate energy intake, presumably by a negative feedback system. A case has been made for volatile fatty acids (VFA) as feedback signals. However, in most studies VFA were administered during meals whereas absorption of VFA produced in response to a meal takes place over a period of hours. Therefore, this study examines the effect of voluntary feed intake and rumen fluid VFA of continuous infusions of VFA into yhe rumen during a 5 hour periods. Four adult female goats, fed ad libitum a pelleted feed (0.5 barley : 0.5 dried grass), provided with rumen cannulae, were used to infuse VFA, neutralized with NaOH to pH 4.5-5.5, at a rate of 3.3 ml/min. Acetate, propionate and n-butyrate, separately or as a mixture, were infused at a low and a high rate; NaCl solutions served as controls. Feeding behavior was recorded continuously. Neither propionate (14 and 28 umol/kg/min) non n-butyrate (7 and 14 umol/kg/min) affected 5 h feed intake in spite of large increases of these acids in the rumen fluid. In contrast, acetate depressed 5 h feed intake by 52 percent at the high rate (91 umol/kg/min) and by 22 percent at the low rate (45 umol/kg/min). However, in both cases ruminal acetate rose to very high levels. The mixture of VFA at the low rate did not affect 5 h feed intake whereas the high rate depressed feed intake by 37 percent but the latter infusion resulted in high rumen fluid VFA levels. It is concluded that propionate and n-butyrate do not control feeding behavior whereas a role of acetate as regulator of feed intake, as suggested in the literature, is doubtful in ad libitum fed goatsCAPRINOSALIMENTACION DE LOS ANIMALESCONSUMO DE ALIMENTOSCONSUMO VOLUNTARIOENERGIAACIDOS GRASOS VOLATILESHOLANDAURN:ISBN:0930848179 |
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CAPRINOS ALIMENTACION DE LOS ANIMALES CONSUMO DE ALIMENTOS CONSUMO VOLUNTARIO ENERGIA ACIDOS GRASOS VOLATILES HOLANDA CAPRINOS ALIMENTACION DE LOS ANIMALES CONSUMO DE ALIMENTOS CONSUMO VOLUNTARIO ENERGIA ACIDOS GRASOS VOLATILES HOLANDA |
| spellingShingle |
CAPRINOS ALIMENTACION DE LOS ANIMALES CONSUMO DE ALIMENTOS CONSUMO VOLUNTARIO ENERGIA ACIDOS GRASOS VOLATILES HOLANDA CAPRINOS ALIMENTACION DE LOS ANIMALES CONSUMO DE ALIMENTOS CONSUMO VOLUNTARIO ENERGIA ACIDOS GRASOS VOLATILES HOLANDA 61549 De Jong, A. 6757 Dairy Goat Journal Publishing Co., Scottsdale, AZ (EUA) 33022 3. International Conference on Goat Production and Disease Tucson, AZ (EUA) 10-15 Ene 1982 Proceedings |
| description |
Many experiments suggest that ruminants can regulate energy intake, presumably by a negative feedback system. A case has been made for volatile fatty acids (VFA) as feedback signals. However, in most studies VFA were administered during meals whereas absorption of VFA produced in response to a meal takes place over a period of hours. Therefore, this study examines the effect of voluntary feed intake and rumen fluid VFA of continuous infusions of VFA into yhe rumen during a 5 hour periods. Four adult female goats, fed ad libitum a pelleted feed (0.5 barley : 0.5 dried grass), provided with rumen cannulae, were used to infuse VFA, neutralized with NaOH to pH 4.5-5.5, at a rate of 3.3 ml/min. Acetate, propionate and n-butyrate, separately or as a mixture, were infused at a low and a high rate; NaCl solutions served as controls. Feeding behavior was recorded continuously. Neither propionate (14 and 28 umol/kg/min) non n-butyrate (7 and 14 umol/kg/min) affected 5 h feed intake in spite of large increases of these acids in the rumen fluid. In contrast, acetate depressed 5 h feed intake by 52 percent at the high rate (91 umol/kg/min) and by 22 percent at the low rate (45 umol/kg/min). However, in both cases ruminal acetate rose to very high levels. The mixture of VFA at the low rate did not affect 5 h feed intake whereas the high rate depressed feed intake by 37 percent but the latter infusion resulted in high rumen fluid VFA levels. It is concluded that propionate and n-butyrate do not control feeding behavior whereas a role of acetate as regulator of feed intake, as suggested in the literature, is doubtful in ad libitum fed goats |
| format |
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| topic_facet |
CAPRINOS ALIMENTACION DE LOS ANIMALES CONSUMO DE ALIMENTOS CONSUMO VOLUNTARIO ENERGIA ACIDOS GRASOS VOLATILES HOLANDA |
| author |
61549 De Jong, A. 6757 Dairy Goat Journal Publishing Co., Scottsdale, AZ (EUA) 33022 3. International Conference on Goat Production and Disease Tucson, AZ (EUA) 10-15 Ene 1982 |
| author_facet |
61549 De Jong, A. 6757 Dairy Goat Journal Publishing Co., Scottsdale, AZ (EUA) 33022 3. International Conference on Goat Production and Disease Tucson, AZ (EUA) 10-15 Ene 1982 |
| author_sort |
61549 De Jong, A. |
| title |
Proceedings |
| title_short |
Proceedings |
| title_full |
Proceedings |
| title_fullStr |
Proceedings |
| title_full_unstemmed |
Proceedings |
| title_sort |
proceedings |
| publisher |
Scottsdale, AZ (EUA) |
| publishDate |
1982 |
| work_keys_str_mv |
AT 61549dejonga proceedings AT 6757dairygoatjournalpublishingcoscottsdaleazeua proceedings AT 330223internationalconferenceongoatproductionanddiseasetucsonazeua1015ene1982 proceedings |
| _version_ |
1756053803680923648 |