Ali, A.K.A.
(Dept. of Animal Production, College of Agriculture, King Saud University)
,
ALEssa, A.A.
(Dept. of Animal Production, College of Agriculture, King Saud University)
,
Alshaikh, M.A.
(Dept. of Animal Production, College of Agriculture, King Saud University)
,
Aljumaah, R.S.
(Dept. of Animal Production, College of Agriculture, King Saud University)
,
Al-Haidary, A.A.
(Dept. of Animal Production, College of Agriculture, King Saud University)
,
Alkraidees, M.S.
(Dept. of Animal Production, College of Agriculture, King Saud University)
Logistic Regression Analysis was used to compute the odds ratio (OR) and probability of conception of Holstein dairy cows of AL-MARAIE company. Data consisted of 103,778 reproductive records collected from three farms in the central region in the Kingdom of Saudi Arabia. Records were classified acco...
Logistic Regression Analysis was used to compute the odds ratio (OR) and probability of conception of Holstein dairy cows of AL-MARAIE company. Data consisted of 103,778 reproductive records collected from three farms in the central region in the Kingdom of Saudi Arabia. Records were classified according to lactation number, season of calving and milk level. At first lactation, OR of first service was 0.63 of other services and probability of pregnancy from first services was 0.39. Odds ratio increased to 1.72 at fourth lactation or probability of conception reached 0.63. The probability of conception increased from 0.39 for cows inseminated at first services to 0.75 at fifth service insemination. Odds ratio of cows calving in winter were higher than those calving in summer. Odds ratio of conception of low producing cows is about twice as likely to occur from first service as from other services. However, OR of conception of high producing cows was higher than one (probability=0.56) from first service and increased to 1.63 (probability=0.65) from third service. Odds ratio was in favor of the right uterus horn where probability of conception from first service was slightly greater than 50% in first and second lactations and less than 50% in favor of left horn in later lactations.
Logistic Regression Analysis was used to compute the odds ratio (OR) and probability of conception of Holstein dairy cows of AL-MARAIE company. Data consisted of 103,778 reproductive records collected from three farms in the central region in the Kingdom of Saudi Arabia. Records were classified according to lactation number, season of calving and milk level. At first lactation, OR of first service was 0.63 of other services and probability of pregnancy from first services was 0.39. Odds ratio increased to 1.72 at fourth lactation or probability of conception reached 0.63. The probability of conception increased from 0.39 for cows inseminated at first services to 0.75 at fifth service insemination. Odds ratio of cows calving in winter were higher than those calving in summer. Odds ratio of conception of low producing cows is about twice as likely to occur from first service as from other services. However, OR of conception of high producing cows was higher than one (probability=0.56) from first service and increased to 1.63 (probability=0.65) from third service. Odds ratio was in favor of the right uterus horn where probability of conception from first service was slightly greater than 50% in first and second lactations and less than 50% in favor of left horn in later lactations.
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제안 방법
The Logistic regression model was used to examine the relationship between one or more independent variable (1st service versus other services) and the log odds ofthe binary outcome variable (pregnancy and non-pregnancy). The specific form of the logistic regression model as described by Hosmer and Lemeshow (2000) is:
The Logistic regression model was used to examine the relationship between one or more independent variable (1st service versus other services) and the log odds ofthe binary outcome variable (pregnancy and non-pregnancy). The specific form of the logistic regression model as described by Hosmer and Lemeshow (2000) is:
대상 데이터
Two data files were collected from three dairy farms of AL-MARAIE company in the central region of the Kingdom of Saudi Arabia. The data were collected during the period from 1991 to 1999.
성능/효과
Oconnor (2002) used non return rate (60-90 non return ratings) as an indirect measure of fertility, and found that technicians with a non return rate to estrus greater than 78% achieved 86% of their dye depositions in the uterine body and had no extrauterine insemination. Insemination by technician with non-return rates below 70% resulted in only 34% of the dye deposition in the uterine body and 31% extrauterine insemination.
Significant differences (X2 with p<0.01) were found between the two responses (pregnancy versus non-pregnancy), from first service, across farms, across lactation, and between two seasons of calving; the differences mainly reflect the managerial effects, age effect and weathering stress.
Significant differences (X2 with p<0.01) were found between the two responses (pregnancy versus non-pregnancy), from first service, across farms, across lactation, and between two seasons of cal.,ing; the differences mainly reflect the managerial effects, age effect and weathering stress.
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