Factors affecting response of groups of dairy cows managed for different calving-conception intervals

Schindler, H; Eger, Sarah J.; Davidson, M.; Ochowski, D.; Schermerhorn, E.C.; Foote, R.H.

doi:10.1016/0093-691x(91)90478-v

Cited by 34 publications

(20 citation statements)

References 14 publications

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“…The higher incidence of endometritis (22.3%) observed in the study might be due to the higher incidence of retained fetal membrane after calving. Placental retention resulted in low fertility [9], delayed onset of first behavioural estrus and resumption of the estrous cycle after calving [10], and a decrease in the rate of uterine involution in the postpartum period [8]. Dohoo and Martin [11], concluded that retained fetal membranes might have little direct effect on reproductive performance but increase infections of the reproductive tract.…”

Section: Discussionmentioning

confidence: 99%

Factors Leading to Endometritis in Dairy Cows in Egypt with Special Reference to Reproductive Performance.

Ghanem

Shalaby

Sharawy

et al. 2002

Journal of Reproduction and Development

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Abstract. The incidence of endometritis and risk factors between herds and between breeds and its effect on the subsequent fertility of cows may differ among countries. It is therefore necessary to study the etiology of endometritis in these different circumstances. This work was carried out on 190 Holstein Friesian cows (2.5-13 years old) belonging to El-Salhia Agriculture project (Ismailia Province, Egypt) during the period from January 1996 to April 1997. The incidence of endometritis was 22.4%, and the most prominent risk factors leading to the occurrence of endometritis were retained placenta, stillbirth, external interference by herdmen during calving and difficult birth (20.6, 19.1, 12.3 and 5.3% respectively). The cows in the first parity had a higher incidence of endometritis (27.7%) than cows in the subsequent parities. Cows which calved in autumn (31.2%) had a higher incidence of endometritis than cows which calved in the other seasons. The endometritic cows had inferior reproductive indices than the normal cows. The interval between calving and first service in cows with endometritis was 14 days longer than the normal ones. The first service conception rate (12.5%) and final conception rate (45.5%) in cows with endometritis were lower than those in the normal cows (50 and 100%) (P<0.05 ). In conclusion the most important risk factors leading to endometritis are retained placenta and abnormal calving in dairy cows in Egypt. Moreover, postpartum endometritis adversely affects subsequent fertility in dairy cows in Egypt.

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Section: Discussionmentioning

confidence: 99%

Factors Leading to Endometritis in Dairy Cows in Egypt with Special Reference to Reproductive Performance.

Ghanem

Shalaby

Sharawy

et al. 2002

Journal of Reproduction and Development

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“…lactation. Nevertheless, other studies, like Kolver et al [17], Larsson and Berglund [13] and Schindler et al [6], found an improved pregnancy rate with use of extended lactation. The estrus_PR results in this paper are similar to those of Schindler et al [6]: the pregnancy rate at first AI increased from 50% to 58% for PL to EL, respectively, and decreased from 58% to 53% for EL to FL, respectively.…”

Section: Pregnancy Ratesmentioning

confidence: 95%

“…pregnancy rates compared with rebreeding in early lactation [6]. In that case, the first AI occurred in a period of more positive or less negative energy balance compared with the early lactation period [7,8].…”

mentioning

confidence: 99%

Effect of Delayed Insemination on Holstein Cows’ Reproductive Performance

Gaillard¹,

Sehested²,

Vestergaard³

2016

JAST-A

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Holstein cows' fertility has decreased in the last decade, creating a need for new management methods to improve the reproductive performance which in this case was defined by pregnancy rates and number of artificial inseminations (AI) per pregnancy. Previous studies showed that deliberately delaying rebreeding until after peak lactation can improve reproductive performance compared with the traditional rebreeding in early lactation. The objective was to compare the reproductive performance of cows in consecutive lactations of different lengths. The reproductive performance (pregnancy rate and number of insemination to pregnancy) of 62 Holstein cows involved in a 16 months extended lactation trial was recorded and compared with the reproductive performance of the previous and following 10 months lactation of the same cows. It was hypothesized that a late rebreeding (at eight months, 16 months lactation) will improve the reproductive performance compared with an early rebreeding (at two months, 10 months lactation) in the previous lactation, and it will have no negative effect on the reproductive performance in the following lactation with an early rebreeding. The results showed that the pregnancy rates were similar for the 16 months lactation and the previous and following 10 months lactations, while the number of AI to pregnancy was increased in the 10 months lactation, following by the 16 months lactation. The use of the double AI technique did not improve pregnancy rates compared with a single AI per estrus, and induced confusion, as how to report the herd reproductive performance. To conclude, the reproductive performance was similar between the heifers, primiparous and multiparous cows, and between 10 months and 16 months lactations.

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“…Milking was continued until 8 weeks before the expected calving, independently of the yield at that time. Additional managerial practices have been described in connexion with a concurrent study of reproductive performance described elsewhere (Schindler, Eger, Davidson, Ochowski, Schermerhorn and Foote, 1991).…”

Section: Methodsmentioning

confidence: 99%

A simulation study of the effects of the calving interval on milk yields of dairy cows in fixed time periods

et al. 1992

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Multiparous cows were assigned before calving to three calving to first insemination intervals. Records of cows conceiving at first or second insemination, were used to construct a model of the lactation curve which incorporated peak production and the effect of progressing pregnancy. The model was used to simulate milk yield during a 4-year period for three production levels and five calving intervals. The model separated the descending part of the lactation curve into a linearly and an exponentially declining component, with the latter becoming distinct at about 20 weeks after conception. Peak yield was negatively correlated with the slope of the linear decline. Within a simulated 4-year period, cumulative milk yields at fixed time periods after calving depended upon the period chosen and the calving-to-conception interval of the cow. Late conceptions resulted in higher cumulative yields at the end of the 1st year, and in lower yields at the 2nd year end, with respect to early conceptions. Smaller differences were found between the intermediate calving intervals. During the 3rd and 4th years the early conceptions had a distinct advantage. Different rates of the linear decline, obtained for the different production levels, changed the magnitude of the yield differences between the calving intervals but not their relative ranking. The model presented offers a means for the suitable choice of the calving cycle according to the length of the period for which a cow is expected to remain in the herd.

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Factors affecting response of groups of dairy cows managed for different calving-conception intervals

Cited by 34 publications

References 14 publications

Factors Leading to Endometritis in Dairy Cows in Egypt with Special Reference to Reproductive Performance.

Factors Leading to Endometritis in Dairy Cows in Egypt with Special Reference to Reproductive Performance.

Effect of Delayed Insemination on Holstein Cows’ Reproductive Performance

A simulation study of the effects of the calving interval on milk yields of dairy cows in fixed time periods

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