The effects of dietary protein on age and weight at the onset of puberty in Brown Swiss and Zebu heifers in the tropics.

The effects of dietary protein on age and weight at the onset of puberty in Brown Swiss and Zebu heifers in the tropics. Research Abstract Details 

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The effects of dietary protein on age and weight at the onset of puberty in Brown Swiss and Zebu heifers in the tropics. Abstract Text:

P Fajersson,H V Barradas,H Roman-Ponce,R M Cook,

The effects of dietary protein level on age and weight at onset of puberty were studied in the Mexican tropics using 12 Brown Swiss and 12 Zebu heifer calves in a completely randomized block design. The calves were weaned at 3 mo of age. They were confined in individual pens and fed either an adequate protein (12.8%) or a high protein (16.4%) diet ad libitum through the onset of puberty, which was defined as the first ovulation. To detect the first ovulation, heifers were palpated at 8 mo of age and then every 2 wk. At the detection of a developing follicle or any behavioral sign of estrus, they were palpated daily. Ovulation was confirmed by palpation of a corpus luteum. A blood sample for the determination of plasma progesterone concentration was taken with each palpation. There was a significant effect of breed on age at the onset of puberty, which was 9.4 and 12.3 mo for the Brown Swiss and Zebu heifers, respectively. Weight at puberty was 233 kg, independent of breed. Dietary protein had no effect on the onset of puberty. Brown Swiss heifers reach puberty earlier than Zebu heifers. Heifers in the tropics fed according to NRC recommendations reach puberty at ages comparable to those in temperate climate. This suggests that, if managed properly, calving age for Brown Swiss and Zebu heifers can be 24 and 27 mo, respectively. This is a considerable improvement from 36 to 48 mo of age now common in the area of study.

The effects of dietary protein on age and weight at the onset of puberty in Brown Swiss and Zebu heifers in the tropics. Publishing Authors By Initials

P Fajersson,HV Barradas,H Roman-Ponce,RM Cook,

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The effects of dietary protein on age and weight at the onset of puberty in Brown Swiss and Zebu heifers in the tropics. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Theriogenology

VOLUME: 35

Page Numbers: 845-55

Journal Abbreviation: Theriogenology

ISSN: 0093-691X

DAY: 26

MONTH: Apr

YEAR: 1991

The effects of dietary protein on age and weight at the onset of puberty in Brown Swiss and Zebu heifers in the tropics. Information

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LANGUAGE: eng

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Grant and Affiliation Information for The effects of dietary protein on age and weight at the onset of puberty in Brown Swiss and Zebu heifers in the tropics.

AFFILIATION: Department of Animal Science Michigan State University East Lansing, Michigan USA.

Country: United States

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MEDLINETA: Theriogenology

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