Milk progesterone profiles in crossbred Brown Swiss x Nellore cattle following natural service.

Milk progesterone profiles in crossbred Brown Swiss x Nellore cattle following natural service. Research Abstract Details 

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Milk progesterone profiles in crossbred Brown Swiss x Nellore cattle following natural service. Abstract Text:

M Garcia,

Ovarian activity and estrous behaviour were monitored through milk progesterone determinations and twice daily visual observations in 70 crossbred Brown Swiss x Nellore cows following natural service. Whole milk samples were collected on the day of estrus (Day 1), Day 11, and every 5 d thereafter until the next estrus or pregnancy confirmation. Seventy percent of the cows behaved as expected, i.e. they showed a 19-to 25-d interval between estrus and the next ovulation, or they became pregnant. Estrous cycles of regular length (18 to 24 d) were found in 54% of the cases. Prolonged luteal phases (interval from estrus to next ovulation > 28 d) were found in 15.7% of cows. Short estrous cycles (interestrous interval < 18 d) were found in 7.1% of the cases. Periods of acyclicity (basal progesterone levels for periods >/= 15 d) were found in 5.8% of the cases, and one cow exhibited estrus while pregnant and had a high progesterone concentration. Cows with a prolonged luteal phase and those with a short estrous cycle had an interval between ovulations of 35.0 +/- 6.7 d (x +/- SD) and 9.6 +/- 3.1 d, respectively. Signs of estrus were not detected in 33.3% of the ovulations confirmed by progesterone determinations. Low conception rates, failures in estrus detection and a high frequency of abnormal postbreeding luteal phases were found.

Milk progesterone profiles in crossbred Brown Swiss x Nellore cattle following natural service. Publishing Authors By Initials

M Garcia,

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Milk progesterone profiles in crossbred Brown Swiss x Nellore cattle following natural service. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Theriogenology

VOLUME: 33

Page Numbers: 1105-11

Journal Abbreviation: Theriogenology

ISSN: 0093-691X

DAY: 26

MONTH: May

YEAR: 1990

Milk progesterone profiles in crossbred Brown Swiss x Nellore cattle following natural service. Information

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LANGUAGE: eng

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AFFILIATION: Veterinary Institute for Tropical and High Altitude Research (IVITA) University of San Marcos, Box 4270, Lima, Peru; Department of Clinical Chemistry, Swedish University of Agricultural Sciences Box 7038, 750 07 Uppsala, Sweden.

Country: United States

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MEDLINETA: Theriogenology

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