Effect of protein level and methionine supplementation on dairy cows during the transition period.
J Dairy Sci
; 104(5): 5467-5478, 2021 May.
Article
en En
| MEDLINE
| ID: mdl-33685687
Cows experience a significant negative protein balance during the first 30 d of lactation. Given the functional effects of AA on health, especially in challenging periods such as calving, higher levels of protein and specific AA in the diet may act to improve health and feed intake. The response of dairy cows to 3 protein supplementation strategies during the transition period and through the first 45 d in milk was evaluated. The final data set had 39 Holstein cows blocked based on parity (primiparous vs. multiparous) and expected calving and randomly assigned within each block to one of 3 dietary treatments: low protein (LP), high protein (HP), or high protein plus rumen-protected methionine (HPM). Treatments were offered from d -18 ± 5 to 45 d relative to parturition. Pre- and postpartum diets were formulated for high metabolizable protein (MP) supply from soybean meal, and HP and HPM provided higher MP balance than LP. Preplanned contrasts were LP versus HP+HPM and HP versus HPM. Significance was declared at P ≤ 0.05 and trends at 0.05
Asunto(s)
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Metionina
/
Proteínas de la Leche
Límite:
Animals
/
Pregnancy
Idioma:
En
Revista:
J Dairy Sci
Año:
2021
Tipo del documento:
Article
País de afiliación:
Brasil
Pais de publicación:
Estados Unidos
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Metionina
/
Proteínas de la Leche
Límite:
Animals
/
Pregnancy
Idioma:
En
Revista:
J Dairy Sci
Año:
2021
Tipo del documento:
Article
País de afiliación:
Brasil
Pais de publicación:
Estados Unidos