Pregnancy Attrition Associated with Pregnancy Testing by Rectal Palpation

J. A. Thompson; W. E. Marsh; J. A. Calvin; W. G. Etherington; H. W. Momont; M. L. Kinsel

doi:10.3168/jds.S0022-0302(94)77280-5

Pregnancy Attrition Associated with Pregnancy Testing by Rectal Palpation

J. A. Thompson^*, W. E. Marsh, J. A. Calvin, W. G. Etherington, H. W. Momont, M. L. Kinsel

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

23 Scopus citations

Abstract

The objective of this study was to estimate the effect on calving risk of interval from AI date until scheduled date of pregnancy examination. First AI (n = 7105) from 65 dairy herds in the United States and Canada were followed for 294 d to determine whether cows calved. Calving was modeled as a function of the number of days in the interval, herd, season, and breeding at PGF_2α-induced estrus by multivariate logistic regression. The main effects of herd and AI following PGF_2α-induced estrus were significantly associated with calving rate from first AI. The main effects of interval and season were not significantly associated with calving. The effects of PGF_2α, season, and interval between AI and pregnancy testing varied significantly among herds. These effects appear to be symmetric in their distributions about their means. The risk of day of palpation on calving is herd dependent and small compared with other herd factors.

Original language	English (US)
Pages (from-to)	3382-3387
Number of pages	6
Journal	Journal of Dairy Science
Volume	77
Issue number	11
DOIs	https://doi.org/10.3168/jds.S0022-0302(94)77280-5
State	Published - 1994
Externally published	Yes

Keywords

INT
OC
herd
pregnancy attrition
rectal palpation
the length of interval (days) from AI date until scheduled date of pregnancy examination
the outcome of calving (1 = yes, 0 = no)

ASJC Scopus subject areas

Food Science
Animal Science and Zoology
Genetics

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10.3168/jds.S0022-0302(94)77280-5

Cite this

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title = "Pregnancy Attrition Associated with Pregnancy Testing by Rectal Palpation",

abstract = "The objective of this study was to estimate the effect on calving risk of interval from AI date until scheduled date of pregnancy examination. First AI (n = 7105) from 65 dairy herds in the United States and Canada were followed for 294 d to determine whether cows calved. Calving was modeled as a function of the number of days in the interval, herd, season, and breeding at PGF2α-induced estrus by multivariate logistic regression. The main effects of herd and AI following PGF2α-induced estrus were significantly associated with calving rate from first AI. The main effects of interval and season were not significantly associated with calving. The effects of PGF2α, season, and interval between AI and pregnancy testing varied significantly among herds. These effects appear to be symmetric in their distributions about their means. The risk of day of palpation on calving is herd dependent and small compared with other herd factors.",

keywords = "INT, OC, herd, pregnancy attrition, rectal palpation, the length of interval (days) from AI date until scheduled date of pregnancy examination, the outcome of calving (1 = yes, 0 = no)",

author = "Thompson, {J. A.} and Marsh, {W. E.} and Calvin, {J. A.} and Etherington, {W. G.} and Momont, {H. W.} and Kinsel, {M. L.}",

year = "1994",

doi = "10.3168/jds.S0022-0302(94)77280-5",

language = "English (US)",

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AU - Thompson, J. A.

AU - Marsh, W. E.

AU - Calvin, J. A.

AU - Etherington, W. G.

AU - Momont, H. W.

AU - Kinsel, M. L.

PY - 1994

Y1 - 1994

N2 - The objective of this study was to estimate the effect on calving risk of interval from AI date until scheduled date of pregnancy examination. First AI (n = 7105) from 65 dairy herds in the United States and Canada were followed for 294 d to determine whether cows calved. Calving was modeled as a function of the number of days in the interval, herd, season, and breeding at PGF2α-induced estrus by multivariate logistic regression. The main effects of herd and AI following PGF2α-induced estrus were significantly associated with calving rate from first AI. The main effects of interval and season were not significantly associated with calving. The effects of PGF2α, season, and interval between AI and pregnancy testing varied significantly among herds. These effects appear to be symmetric in their distributions about their means. The risk of day of palpation on calving is herd dependent and small compared with other herd factors.

AB - The objective of this study was to estimate the effect on calving risk of interval from AI date until scheduled date of pregnancy examination. First AI (n = 7105) from 65 dairy herds in the United States and Canada were followed for 294 d to determine whether cows calved. Calving was modeled as a function of the number of days in the interval, herd, season, and breeding at PGF2α-induced estrus by multivariate logistic regression. The main effects of herd and AI following PGF2α-induced estrus were significantly associated with calving rate from first AI. The main effects of interval and season were not significantly associated with calving. The effects of PGF2α, season, and interval between AI and pregnancy testing varied significantly among herds. These effects appear to be symmetric in their distributions about their means. The risk of day of palpation on calving is herd dependent and small compared with other herd factors.

KW - INT

KW - OC

KW - herd

KW - pregnancy attrition

KW - rectal palpation

KW - the length of interval (days) from AI date until scheduled date of pregnancy examination

KW - the outcome of calving (1 = yes, 0 = no)

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SN - 0022-0302

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JO - Journal of Dairy Science

JF - Journal of Dairy Science

IS - 11

ER -

Pregnancy Attrition Associated with Pregnancy Testing by Rectal Palpation

Abstract

Keywords

ASJC Scopus subject areas

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