Angeles-Hernandez Juan Carlos, Cervantes-Bazán Josué Vicente, Vieyra-Alberto Rodolfo, Lorenzana-Moreno Angelica Valeria, Garduño-García Ángel, Lizarazo-Chaparro Augusto César
Departamento de Medicina y Zootecnia de Rumiantes, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, Coyoacán, Ciudad de México C.P. 04510, Mexico.
Departamento de Ingeniería Mecánica Agrícola, Universidad Autónoma Chapingo, Carr. México-Texcoco Km. 38.5, Chapingo, Texcoco C.P. 56230, Estado de México, Mexico.
Animals (Basel). 2025 Mar 27;15(7):960. doi: 10.3390/ani15070960.
In dairy sheep, optimum nutrition is required to maintain a positive energy and nitrogen balance, and therefore, achieve adequate performance levels. In this sense, supplemental rumen-protected methionine (RPMet) has been a nutritional strategy used to improve the availability of amino acids in sheep for milk production. The aim of the current study is to assess the effect of RPMet supplementation on the milk yield and milk composition of crossbred dairy sheep. Twenty F1 sheep (50% Pelibuey × 50% East Friesian) were randomly assigned to one of the following three treatments: C (control: 0 g/d), 3 g (3.0 g/d), or 6 g (6 g/d) of RPMet added to the basal diet from day 2 to 120 after lambing. Milk yield was significantly higher in sheep supplemented with 6 g of RPMet ( = 0.04) with a linear effect ( < 0.001). In relation to protein yield, the 6 g treatment showed the highest values (55.5 g/day) in comparison with the control (35.2 g/day) and 3 g (42.3 g/day) treatments. Also, lactose ( = 0.02) and non-fat solid yield ( = 0.03) were positively affected by the methionine supplementation. Our results suggest that methionine supplementation is an option to increase milk production, likely associated with the better availability of nutrients of dairy sheep farms using crossbred sheep in regions with an incipient dairy sheep industry.
在奶羊养殖中，需要最佳营养来维持正能量和氮平衡，从而达到足够的生产性能水平。从这个意义上讲，补充瘤胃保护蛋氨酸（RPMet）一直是一种营养策略，用于提高绵羊体内氨基酸的利用率以促进产奶。本研究的目的是评估补充RPMet对杂交奶羊产奶量和奶成分的影响。将20只F1代绵羊（50%佩利布埃×50%东弗里生）随机分配到以下三种处理之一：C组（对照组：0克/天），从产羔后第2天至120天，在基础日粮中添加3克（3.0克/天）或6克（6克/天）的RPMet。补充6克RPMet的绵羊产奶量显著更高（ = 0.04），呈线性效应（ < 0.001）。关于蛋白质产量，与对照组（35.2克/天）和3克组（42.3克/天）相比，6克组的值最高（55.5克/天）。此外，补充蛋氨酸对乳糖（ = 0.02）和非脂固形物产量（ = 0.03）有积极影响。我们的结果表明，补充蛋氨酸是增加产奶量的一种选择，这可能与在奶羊产业起步地区使用杂交绵羊的奶羊场营养物质利用率提高有关。
