Effect of ryegrass hay and ryegrass silage, cut at two stages of development, on nutrient digestibility, nitrogen balance, and purine derivative excretion in growing sheep
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Dokumenter
- Effect of ryegrass hay and ryegrass silage, cut at two stages of development, on nutrient digestibility, nitrogen balance, and purine derivative excretion in growing sheep
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The objective of this study was to evaluate nutrient digestibility, nitrogen balance, and purine derivative excretion from growing sheep fed on ryegrass silage (S) or ryegrass hay (H) cut at two maturity stages (21 and 35 d). In an in vivo trial, 32 Suffolk × Merino growing sheep (22 ± 2 kg) were used in a completely randomised design with eighth replications in a 2 × 2 factorial arrangement. Four diets were used containing 75% forage (S at 21 or 35 d and H at 21 or 35 d) and 25% concentrate. In an in vitro trial, a completely randomised design was used for gas production parameters. Contents of N and NDF were higher in H (30 and 674 g/kg DM) than in S (26 and 411 g/kg DM). Animals fed on S had higher digestibility (P <.008) of DM and OM (661 and 715 g/kg) than H at 35 d (557 and 596 g/kg). In vitro gas production was lower (P <.04) in H at 35 d. In vitro DM disappearance at 96 h was lower (P <.03) for H at 35 d. Excretion of allantoin (mmol/day) in urine was higher (P <.001) in S (7.91 and 3.95) than H (5.01 and 3.03) at 21 and 35 d respectively. Overall, compared to ryegrass hay, ryegrass silage cut at 21 d can be an advantageous feeding strategy for growing sheep without negative effects in nutrient intake, N-balance, and purine derivatives.Highlights Contents of N and NDF were higher in hay than in silage form ryegrass. Animals fed on silage had higher digestibility of DM and OM. In vitro gas production was lower in hay cut at 35 days.
Originalsprog | Engelsk |
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Tidsskrift | Italian Journal of Animal Science |
Vol/bind | 20 |
Udgave nummer | 1 |
Sider (fra-til) | 2110-2121 |
Antal sider | 12 |
ISSN | 1594-4077 |
DOI | |
Status | Udgivet - 2021 |
Bibliografisk note
Funding Information:
This study was supported by the Autonomous University of the State of Mexico (Project UAEM 1748), the Secretariat of Agricultural Development (SEDAGRO), and Fundaci?n P RODUCE Estado de M?xico. Einar Vargas-Bello-P?rez was a visiting scholar also supported by project number 4974/2020CIB from Universidad Aut?noma del Estado de M?xico. Lizbeth Esmeralda Robles-Jim?nez and Jose Romero were awarded a Conacyt-Mexico scholarship during their Ph.D. program at the Agricultural Sciences and Natural Resources at the Universidad Autonoma del Estado de M?xico.
Publisher Copyright:
© 2021 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.
ID: 285796584