| Journal: | Scientia Agricola |
| Database: | PERIÓDICA |
| System number: | 000455457 |
| ISSN: | 0103-9016 |
| Authors: | Martins, André Storti1 Polizel, Daniel Montanher2 Oliveira, Gabriela Bagio1 Barroso, José Paulo Roman1 Ferraz-Junior,Marcos Vinicius de Castro3 Miszura, Alexandre Arantes1 Baggio, Marcelo1 Ferreira, Evandro Maia2 Pires, Alexandre Vaz1 |
| Institutions: | 1Universidade de Sao Paulo, Faculdade de Medicina Veterinaria e Zootecnia, Pirassununga, Sao Paulo. Brasil 2Universidade de Sao Paulo, Escola Superior de Agricultura "Luiz de Queiroz", Piracicaba, Sao Paulo. Brasil 3Universidade Federal do Amazonas, Departamento de Zootecnia, Parintins, Amazonas. Brasil |
| Year: | 2022 |
| Volumen: | 79 |
| Number: | 3 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Experimental, analítico |
| English abstract | Adding ionophores to ruminant diets is a strategy to manipulate ruminal fermentation and improve milk yield. This study evaluates the effects of narasin supply to lactating ewes on dry matter intake (DMI), milk yield and composition, and performance of the lambs. Thirty lactating Santa Inês and Santa Inês × Dorper ewes fed a basal diet containing 50 % coastcross hay and 50 % concentrate were randomly assigned to two treatments: control (CON; without ionophores) or NAR (addition of 13 mg narasin kg–1 DM). From the 2nd to 10th week of lactation, DMI of ewes was determined, and once a week, their milk production and composition was measured over a 3-h interval. At the 10th week of lactation, lambs were weaned and their average daily gain (ADG) and starter DMI continued to be evaluated for two more weeks. Narasin supply did not affect weight and DMI of ewes. Ewes fed NAR had greater feed efficiency for milk production and displayed tendency for higher milk yield. Narasin supply reduced milk protein levels, but it did not affect other milk component levels. Ewes fed NAR had greater production of milk urea nitrogen and showed tendency for higher production of fat and total solids. Starter DMI of lambs was not affected by treatments; however, there was a tendency for greater weaning weight for NAR lambs. At the end of experiment, no differences were observed in the performance of lambs. The supply of 13 mg narasin kg–1 to lactating ewes improved milk yield efficiency and tended to increase the weaning weight of their lambs |
| Disciplines: | Medicina veterinaria y zootecnia, Química |
| Keyword: | Ovinos y caprinos, Nutrición animal, Química de alimentos, Ionóforos, Narasina, Lactancia, Ovejas, Corderos, Leche, Bromatología |
| Keyword: | Sheep and goats, Animal nutrition, Food chemistry, Ionophores, Narasin, Lactation, Ewes, Lambs, Milk, Bromatology |
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