What are the limits to feed intake of broilers on bulky feeds?
The view that genetic selection for carcass yield has limited the size of the gastrointestinal tract (GIT) of modern broilers has sparked concerns that their capacity to cope with energy dilution or bulk is also limited. We investigated the capacity of male Ross 308 broilers to deal with increasing...
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| Format: | Article |
| Language: | English |
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Elsevier
2021-03-01
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| Series: | Poultry Science |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0032579120308543 |
| _version_ | 1819116369824710656 |
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| author | James Taylor Panagiotis Sakkas Ilias Kyriazakis |
| author_facet | James Taylor Panagiotis Sakkas Ilias Kyriazakis |
| author_sort | James Taylor |
| collection | DOAJ |
| description | The view that genetic selection for carcass yield has limited the size of the gastrointestinal tract (GIT) of modern broilers has sparked concerns that their capacity to cope with energy dilution or bulk is also limited. We investigated the capacity of male Ross 308 broilers to deal with increasing levels of bulk and aimed to identify a feed bulk dimension responsible for limiting feed intake (FI). About 528 day-old broilers were allocated to 48 pens and offered a common starter feed until day 8, and 1 of 7 feeds from day 8 to 36 of age: a basal control (B), which was diluted to 3 levels (15, 30, or 45%) with either oat hulls (OH) or sugar beet pulp (SBP). Feed intake was measured daily and birds were dissected for GIT measurements at day 15, 22, and 36. Feed intake increased in birds offered OH15 (135 g/d), OH30 (140 g/d), and SBP15 (138 g/d) compared with birds offered the B feed (106 g/d; SEM 2.4). By increasing FI, birds were able to compensate for the lower energy content of their feeds. The greatest increase in FI was seen on OH30: its energy content (2,273 kcal/kg) was 26% lower than the B feed (3,081 kcal/kg). There was evidence of adaptation on the bulky feeds, as during the last week only birds on SBP45 were limited in FI and performance. The relative weights of the GIT were greater in the SBP than OH series, suggesting that the former needed to accommodate a higher bulk intake. For the OH series the increase in the relative GIT weights was confined to the gizzard and small intestine; whereas for the SBP series, the increase was extended to proventriculus and large intestine. Because only SBP45 was limiting FI, we were unable to identify a bulk dimension to be used to predict FI. Our data reject the suggestion that modern broilers have a reduced ability to cope with reductions in feed energy content. |
| first_indexed | 2024-12-22T05:16:00Z |
| format | Article |
| id | doaj.art-ce3f096e6c7b4e5f979ec299abb45a96 |
| institution | Directory Open Access Journal |
| issn | 0032-5791 |
| language | English |
| last_indexed | 2024-12-22T05:16:00Z |
| publishDate | 2021-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Poultry Science |
| spelling | doaj.art-ce3f096e6c7b4e5f979ec299abb45a962022-12-21T18:37:51ZengElsevierPoultry Science0032-57912021-03-011003100825What are the limits to feed intake of broilers on bulky feeds?James Taylor0Panagiotis Sakkas1Ilias Kyriazakis2Agriculture, School of Natural and Environmental Sciences, Newcastle University, Newcastle on Tyne NE1 7RU, UK; Corresponding author:CCPA Group, Z.A. du Bois de Teillay, Janzé 35150, FranceInstitute for Global Food Security, Queen's University, Belfast BT7 1NN, United KingdomThe view that genetic selection for carcass yield has limited the size of the gastrointestinal tract (GIT) of modern broilers has sparked concerns that their capacity to cope with energy dilution or bulk is also limited. We investigated the capacity of male Ross 308 broilers to deal with increasing levels of bulk and aimed to identify a feed bulk dimension responsible for limiting feed intake (FI). About 528 day-old broilers were allocated to 48 pens and offered a common starter feed until day 8, and 1 of 7 feeds from day 8 to 36 of age: a basal control (B), which was diluted to 3 levels (15, 30, or 45%) with either oat hulls (OH) or sugar beet pulp (SBP). Feed intake was measured daily and birds were dissected for GIT measurements at day 15, 22, and 36. Feed intake increased in birds offered OH15 (135 g/d), OH30 (140 g/d), and SBP15 (138 g/d) compared with birds offered the B feed (106 g/d; SEM 2.4). By increasing FI, birds were able to compensate for the lower energy content of their feeds. The greatest increase in FI was seen on OH30: its energy content (2,273 kcal/kg) was 26% lower than the B feed (3,081 kcal/kg). There was evidence of adaptation on the bulky feeds, as during the last week only birds on SBP45 were limited in FI and performance. The relative weights of the GIT were greater in the SBP than OH series, suggesting that the former needed to accommodate a higher bulk intake. For the OH series the increase in the relative GIT weights was confined to the gizzard and small intestine; whereas for the SBP series, the increase was extended to proventriculus and large intestine. Because only SBP45 was limiting FI, we were unable to identify a bulk dimension to be used to predict FI. Our data reject the suggestion that modern broilers have a reduced ability to cope with reductions in feed energy content.http://www.sciencedirect.com/science/article/pii/S0032579120308543bulkbroilerfeed intakegastrointestinal tractsugar beet pulp |
| spellingShingle | James Taylor Panagiotis Sakkas Ilias Kyriazakis What are the limits to feed intake of broilers on bulky feeds? Poultry Science bulk broiler feed intake gastrointestinal tract sugar beet pulp |
| title | What are the limits to feed intake of broilers on bulky feeds? |
| title_full | What are the limits to feed intake of broilers on bulky feeds? |
| title_fullStr | What are the limits to feed intake of broilers on bulky feeds? |
| title_full_unstemmed | What are the limits to feed intake of broilers on bulky feeds? |
| title_short | What are the limits to feed intake of broilers on bulky feeds? |
| title_sort | what are the limits to feed intake of broilers on bulky feeds |
| topic | bulk broiler feed intake gastrointestinal tract sugar beet pulp |
| url | http://www.sciencedirect.com/science/article/pii/S0032579120308543 |
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