Factors influencing the fertility of a cattle population

Kruif, Aart de

doi:10.1530/jrf.0.0540507

Cited by 86 publications

(30 citation statements)

References 51 publications

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“…The period of true anoestrus or acyclicity is often prolonged in postpartum suckling beef cows (Oxenreider, 1968;Inskeep and Lishman, 1981). Several authors have commented that seasonal effects on anoestrus may be related purely to differences in nutrition and management (Boyd, 1977;De Kruif, 1978;Tucker, 1982). As the postpartum period of anoestrus in the present study was longest in cows that lost >1 point in body condition score, this duration may be reduced by provision of adequate dietary energy (Wiltbank et al, 1964;Dunn et al, 1969).…”

Section: Discussionmentioning

confidence: 99%

Seasonal changes in nutritional status and reproductive performance of Zebu cows kept under a traditional agro-pastoral system in Tanzania

Kanuya

Matiko

Nkya

et al. 2006

Trop Anim Health Prod

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The objectives of this study were to assess changes in nutritional status/body condition score, percentage pregnancy and calving rate in Zebu cows and to establish the relationship between body condition score loss and postpartum interval to resumption of ovarian activity. A total of 198 cows and postpubertal heifers of the Tanzanian Shorthorn Zebu kept under a traditional management system were randomly selected from 200 smallholder herds. Factors investigated during bi-weekly visits include body condition score (BCS), heart-girth circumference, milk yield and reproductive status of the animals, pregnancy/nonpregnancy and cyclicity/non-cyclicity. Local weather conditions and dates of occurrence of other reproductive events such as calving were also recorded. Calvings occurred all year round but with a strong seasonal distribution characterized by annual peaks observed between April and July. The annual calving pattern was closely related to rainfall, with peak precipitation occurring a few months before peak calving. The overall percentage pregnancy varied from 30% to 50% throughout the year. Postpartum cows exhibited minimum mean BCS and heart-girth circumference 12-14 weeks after calving, and cows with BCS loss >1 point exhibited the longest time interval from calving to onset of ovarian activity.

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Section: Discussionmentioning

confidence: 99%

Seasonal changes in nutritional status and reproductive performance of Zebu cows kept under a traditional agro-pastoral system in Tanzania

Kanuya

Matiko

Nkya

et al. 2006

Trop Anim Health Prod

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“…More recently, Visser et al [45] attributed 19% of the explained variation in conception rate to the individual AI operator, second only to the herd in importance. De Kruif [46] and Barth et al [33] cited personal qualities or personal problems as possible reasons for Insemination factors affecting fertility 551 differences in performance between individuals, or differences over time. The wide variation in conception rates found within both CAI and DIY operators in the present study is a cause for concern and suggests that annual auditing of performance should be carried out within both categories of operator and action taken where results are poor.…”

Section: Discussionmentioning

confidence: 99%

Insemination factors affecting the conception rate in seasonal calving Holstein-Friesian cows

et al. 2003

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-Differences in conception rate to first service between artificial inseminations (AI) carried out by commercial AI operators (CAI) or do-it-yourself operators (DIY), between natural service (NAT) and AI, between different AI sires, and between fresh and frozen-thawed semen, on Irish commercial dairy farms, were studied using logistic regression. The study comprised 12 933 potential first inseminations from 77 spring-calving dairy herds. The data were recorded during 1999 and 2000. Amongst the total, 4 394 cows had repeated records across the two years. Adjustment variables included: herd, year, parity, calving period, calving to service interval, herd size, proportion of North American Holstein-Friesian genes, peak milk yield, semen fresh or frozen-thawed status, AI sire and a cow history variable to account for the correlation structure that may exist between performance records of cows present in both years of the study. Interactions of interest were tested but were non-significant. No significant association was observed between the category of AI operator and the likelihood of conception rate to first service (PREG1). The variation in PREG1 observed within the category of operator (CAI and DIY) was investigated using the Levene test for homogeneity of variance. There was no difference between the level of variation observed within CAI and DIY operators. There were significant differences in the likelihood of PREG1 between different AI sires. Amongst the 40 most commonly used AI sires, 3 sires had a lower likelihood of PREG1 (P < 0.05) when compared to the reference AI sire (sire with PREG1 similar to the mean of the group). There was a tendency for a reduced likelihood of PREG1 with the use of fresh semen compared to frozen-thawed semen (OR = 0.80, P = 0.067). Amongst the adjustment variables in the model, those significantly associated with the likelihood of PREG1 included the herd, calving period, calving to first service interval and peak milk yield. No significant difference in the likelihood of PREG1 was observed between AI and NAT.artificial insemination / fertility / DIY AI / natural service * Corresponding author: fbuckley@moorepark.teagasc.ie Reprod. Nutr. Dev. 43 (2003) 543-555 543

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“…The incidence of repeat breeding in dairy cows, worldwide, ranges from 3 to 10%, (Bartlett et al, 1986;Kimura et al, 1987). The potential causes of the repeat breeding mainly include subclinical endometritis (Rao et al, 1982;Ahmed et al, 2013), nutritional deficiency, specially trace minerals and vitamin A (Frances et al, 1977;Peters, 1996;Ahmed et al, 2009), age of the dam (Bartlett et al, 1986), improper heat detection (Dekriuf et al, 1978), and endocrine dysfunction (Gustafsson et al, 1986;Bage et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of different parameters in relation to repeat breeding of cows at the Coastal areas of Bangladesh

Matubber¹,

Paul²,

Das³

2018

Res. Agric. Livest. Fish.

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The aim of this study was to evaluate the presumptive factors might be responsible for repeat breeding syndrome of cows in Bangladesh. The study was conducted in different villages around the Faculty of Animal Science and Veterinary Medicine, Patuakhali Science and Technology University, Outer campus, Barisal during the period from July to September 2017. A total of 100 repeat breeder cows were evaluated considering different presumptive influencing factors such as breed, age, parity, body condition score (BCS), fetal death, retention of placenta, post-partum endometritis, abortion, dystocia and managemental practices of cows. It was found that there was no significance (p>0.05) effect of parity and age of cows on the occurrence of repeat breeding syndrome in local and crossbred cows. Repeat breeding syndrome was significantly higher in BCS 2.0 to 2.5 in local breed and 3.0 to 3.5 in crossbred cows than that of other groups. In the study animals, dystocia was 4.0%, fetal death was 58.2%, retention of placenta was 57.1%, post-partum endometritis was 4.1% in crossbred cows. Cows in semi-intensive system raring had significantly (P<0.05) higher (53.1%) of repeat breeding than that of others systems. Animals that were not dewormed (73.5%) and vaccinated (92.9%) had 73.5 % and 92.9% repeat breeding syndrome affected cows, respectively. It may concluded that simultaneously multiple factors such as irregular deworming and vaccination, subclinical endometritis, hormonal imbalance, early embryonic death due to low progesterone level, failure of proper heat detection and so on, might be also responsible to the occurrence of repeat breeding syndrome in cows.Res. Agric., Livest. Fish.5(1): 49-55, April 2018

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Factors influencing the fertility of a cattle population

Cited by 86 publications

References 51 publications

Seasonal changes in nutritional status and reproductive performance of Zebu cows kept under a traditional agro-pastoral system in Tanzania

Seasonal changes in nutritional status and reproductive performance of Zebu cows kept under a traditional agro-pastoral system in Tanzania

Insemination factors affecting the conception rate in seasonal calving Holstein-Friesian cows

Evaluation of different parameters in relation to repeat breeding of cows at the Coastal areas of Bangladesh

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