Effects of Parity on Postpartum Fertility Parameters in Holstein Dairy Cows

Elmetwally, MohammedA; Montaser, Abdelmonem; Elsadany, N; Bedir, W; Hussein, Mamdouh; Zaabel, Samy

doi:10.9790/2380-0908029199

Cited by 13 publications

(14 citation statements)

References 21 publications

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“…by increases afterwards (Elmetwally et al, 2016) have been observed in other studies. The phenotypic mean of NSC linearly increased at consecutive parities and this change only was statistically significant (p<0.01) but differences between mean of NSC in parity 2, 3 and 4 was not statistically significant (p>0.05).…”

Section: Genetic Eigenvalues Eigenfunctions and Selection Indicessupporting

confidence: 83%

Eigenvector index for two female fertility traits based in random regression coefficients matrix in Holstein cows

Ghiasi

Carabaño

2018

Span. j. agric. res.

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A total of 71,518 days open (DO) and number of services per conception (NSC) records of 28,523 Iranian Holstein cows were analysed by random regression model. Akaike's information criterion and likelihood ratio test suggested that a model with quadratic Legendre polynomials for additive genetic and permanent environmental was best. Heritability in different parities ranged from 0.103 to 0.045 in first parity and 0.054 to 0.030 in sixth parity for DO and NSC, respectively. Estimated genetic correlations between parities decreased continuously with increasing distance between parities for both DO and NSC. The first eigenfunction explained 89.99% and 97.22 % of the total genetic variance of DO and NSC, while the second eigenfunction accounted 6.24% and 3.18%, respectively. Different selection indices were constructed for DO and NSC. Genetic response to improve overall fertility was greater when the index included the first eigenvector than the response obtained from indices excluding it. Similar genetic gains were obtained from the first eigenvector, which had a nearly flat associated eigenfunction along lactations and from selection by the intercept of the random regression. The first eigenvector indices were responsible of changes in the level of DO and NSC in a similar manner for all parities, without altering the shape of the response curve across parities. The second and third eigenvector indices modified the shape of this curve but the improvement in genetic gains by including them in the selection index were small (DO) or negligible (NSC) due to the small amount of variability associated with these components.

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Section: Genetic Eigenvalues Eigenfunctions and Selection Indicessupporting

confidence: 83%

Eigenvector index for two female fertility traits based in random regression coefficients matrix in Holstein cows

Ghiasi

Carabaño

2018

Span. j. agric. res.

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“…Yusuf et al () also suggest that cows with more than four births have more services per conception DeVries, Holtshausen, Oba, and Beauchemin () adds the role of the Negative Energy Balance, which affects more intensively multiparous than primiparous cows. In turn, it has been observed that the increase in parity causes a significant enlargement in days open (Elmetwally et al, ), but not in the return to ovarian activity after calving.…”

Section: Discussionmentioning

confidence: 99%

Resynchronization with the G6G protocol: A retrospective, observational study of second and later timed artificial inseminations on commercial dairy farms

Patrón

López-Helguera

Pesantez-Pacheco

et al. 2018

Reprod Domestic Animals

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We recorded conception rates and estimated pregnancy rates following second and later timed artificial inseminations (TAIs) after hormonal resynchronization on commercial dairy farms, using the so-called G6G protocol (PGF day-0; GnRH 2, 8 days; PGF 15, 16 days, GnRH 17 days; TAI 18 days), and the 5-day Ovsynch protocol or 5DO (GnRH day 0; PGF 5, 6 days; GnRH 7 days; TAI 8 days). In four farms, both protocols were implemented in parallel, and these 1,368 s and later TAIs were used for the protocols' comparison based on logistic regression (544 TAIs in primiparous; 824 in multiparous cows; 1,024 TAIs after G6G [600 TAIs in multiparous and 424 in primiparous]; 344 TAIs after 5DO [224 TAIs in multiparous and 120 in primiparous]; 280 TAIs during the hot season; 1,088 during the cool season). Conception rate (CR) was 31.7% ± 12.0% among all cows, 35.1% ± 10.7% among cows resynchronized with the G6G protocol and 21.8% ± 9.7% among cows resynchronized with the 5DO protocol (p < 0.0001). CR among all cows was lower during the hot season (19.3% ± 8.4%) than during the cool season (34.9% ± 10.6%; p < 0.0001), and similar seasonal results were observed with G6G protocols. Logistic regression showed significant effects on CR in second and later TAIs by protocol (OR = 0.514; 95% CI 0.385-0.686; p < 0.0001) and season (OR = 0.486; 95% CI 0.350-0.676; p < 0.0001). Parity did not influence CR after second and later TAIs (p > 0.1), and no interaction with season or resynchronization protocol was found. Estimated pregnancy rates based on these CR data from both hormonal protocols suggest that G6G can be effectively used for second and later TAIs and highlight the importance of considering protocol and season when designing strategies for second and later timed AIs on dairy farms.

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“…The restoration of the uterus to its normal non-pregnant size and function after parturition is termed uterine involution which depends on the rate of myometrial contractions, elimination of bacterial infection and the histological regeneration of the endometrium [1,2,3]. Involution of the uterus is necessary before the cow can conceive again.…”

Section: Uterine Involutionmentioning

confidence: 99%

Uterine Involution and Ovarian Activity in Postpartum Holstein Dairy Cows. A Review

Elmetwally

2018

JVHC

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Following parturition in the cow, there is a significant period of sexual quiescence of variable length. This period of reproductive quiescence was found to be longer in suckling or intensively milked animals.This acyclic period is generally considered as the postpartum anoestrous period. The postpartum period constitutes an important period in the reproductive life of dairy cows because of its enormous influence upon subsequent fertility. The entire postpartum period, puerperium, is defined as the period from parturition until the genital organs return to its normal physiological and histological condition, as in normal non-gravid state. They added that any extension of the puerperium in cows might have a detrimental effect on the reproductive performance of the individual animal. Thus, the main determinant of this period is essentially dependent on the resumption of normal ovarian cycles, the manifestation of estrus behaviour and conception following insemination.

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Effects of Parity on Postpartum Fertility Parameters in Holstein Dairy Cows

Abstract: The aim of this study was to investigate the interactive and main effects of parity numbers, parity seasonand parity month on postpartum fertility parameters [ovarian rebound (OR), days open (DO) and number of services per conception (S/C

Cited by 13 publications

References 21 publications

Eigenvector index for two female fertility traits based in random regression coefficients matrix in Holstein cows

Eigenvector index for two female fertility traits based in random regression coefficients matrix in Holstein cows

Resynchronization with the G6G protocol: A retrospective, observational study of second and later timed artificial inseminations on commercial dairy farms

Uterine Involution and Ovarian Activity in Postpartum Holstein Dairy Cows. A Review

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