Associations Between Herd Characteristics and Reproductive Efficiency in Dairy Herds

Löf, Emma; Gustafsson, H.; Emanuelson, Ulf

doi:10.3168/jds.2006-819

Cited by 36 publications

(29 citation statements)

References 32 publications

(34 reference statements)

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“…This is in agreement with a number of studies on Bali cattle and other breed [7][8][9][10]. The mean calving interval indicated that reproduction efficiency of the cows was in accordance to other studies for Bali breed and other beef and dairy cattle breeds [10][11][12]. Hafez [13] stated that calving interval depends on the efficiency of heat detection (in the case of AI) and fertility of the males and females.…”

Section: Discussionsupporting

confidence: 77%

Most Probable Producing Ability of Bali Cows for Calving Interval and Calf Growth Performance

Supriyantono¹,

Widayati²,

Sumpe³

2017

JAST-A

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Most probable producing ability (MPPA) is the one factor used to compare the performance potential of dam based on the data of their progeny. The purpose of the research was to study the genetic ability of weaning weight, yearling weight and calving interval of Bali cows. The weaning weight data of 296 cows derived from 99 dams, yearling weight data of 245 cows derived from 86 dams and calving interval data of 194 cows from 63 dams were used to estimate repeatability and MPPA of Bali cows in a herd for the three traits. Repeatability of three traits was estimated by analysis of intra-class correlation, and these in turn were used for calculating the estimated MPPA of cows. The results showed that the means of weaning weight of males and females were 95.56 ± 17.25 kg and 87.57 ± 18.45 kg, respectively; means of yearling weight were 143.39 ± 25.78 kg and 136.90 ± 22.01 kg, respectively; and mean calving interval was 391.62 ± 22.59 d. The estimated repeatability of weaning weight, yearling weight and calving interval were 0.006 ± 0.059, 0.022 ± 0.068 and 0.115 ± 0.078, respectively. The best 10 dams in the herd based on the estimates of MPPA for weaning weight, yearling weight and calving interval were not the same for the three traits.

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Section: Discussionsupporting

confidence: 77%

Most Probable Producing Ability of Bali Cows for Calving Interval and Calf Growth Performance

Supriyantono¹,

Widayati²,

Sumpe³

2017

JAST-A

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“…Therefore, cows are more likely to be inseminated at the optimum time, improving reproductive performance (Pursley et al, 1998). Large herds have a greater number of AI than small herds (Löf et al, 2007). Herd size is also related to the management system and can be a useful additional information to make inferences about herd reproductive performance.…”

Section: Resultsmentioning

confidence: 99%

Factors associated with 56-day non-return rate in dairy cattle

Fouz¹,

Gandoy²,

Sanjuán

et al. 2011

Pesq. agropec. bras.

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-The objective of this work was to identify factors associated with the 56-day non-return rate (56-NRR) in dairy herds in the Galician region, Spain, and to estimate it for individual Holstein bulls. The experiment was carried out in herds originated from North-West Spain, from September 2008 to August 2009. Data of the 76,440 first inseminations performed during this period were gathered. Candidate factors were tested for their association with the 56-NRR by using a logistic model (binomial). Afterwards, 37 sires with a minimum of 150 first performed inseminations were individually evaluated. Logistic models were also estimated for each bull, and predicted individual 56-NRR rate values were calculated as a solution for the model parameters. Logistic regression found four major factors associated with 56-NRR in lactating cows: age at insemination, days from calving to insemination, milk production level at the time of insemination, and herd size. First-service conception rate, when a particular sire was used, was higher for heifers (0.71) than for lactating cows (0.52). Non-return rates were highly variable among bulls. A significant part of the herd-level variation of 56-NRR of Holstein cattle seems attributable to the service sire. High correlation level between observed and predicted 56-NRR was found.Index terms: dairy cattle, logistic models, reproductive performance, sire influence. Fatores associados à taxa de não retorno em 56 dias em bovinos leiteirosResumo -O objetivo deste trabalho foi identificar fatores associados com a taxa de não retorno de 56 dias (56-TNR) em rebanhos leiteiros na região da Galícia, Espanha, e estimá-las individualmente para touros da raça Holandesa. O experimento foi realizado em rebanhos do Noroeste da Espanha, entre setembro de 2008 e agosto de 2009. Recolheram-se dados das 76.440 primeiras inseminações realizadas durante este período. Foram avaliados os possíveis fatores candidatos quanto à sua associação com 56-TNR por meio de um modelo logístico (binomial). Posteriormente, 37 touros com um mínimo de 150 inseminações realizadas foram avaliados individualmente. Os modelos logísticos foram estimados também para cada touro, e os valores preditos de 56-TNR foram calculados como solução dos parâmetros do modelo. A regressão logística encontrou quatro fatores principais associados a 56-TNR em vacas lactantes: idade à inseminação, período do parto à inseminação, produção de leite no momento da inseminação e tamanho do rebanho. A taxa de prenhez à primeira inseminação, quando um touro particular foi utilizado, foi maior em novilhas (0,71) do que em vacas lactantes (0,52). Os valores da taxa de não retorno foram altamente variáveis entre touros. Uma proporção significativa da variação, no rebanho, de 56-TNR em touros de raça Holandesa é imputável ao touro. Foi encontrada uma alta correlação entre os valores observados e estimados para 56-TNR.Termos para indexação: bovinos leiteiros, modelos logísticos, desempenho reprodutivo, efeito paterno.

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“…However, an earlier study (Dearing et al, 2004) has reported increased intervals from calving to conception and decreased conception rate during year one compared to the year prior to an automatic milking systems being commissioned under research conditions. On the other hand, Löf et al (2007) found that herds with automatic milking systems had shorter duration of calving to first insemination and conception compared with herds milked conventionally.…”

Section: Time Relative To Automatic Milking Systems Commissioningmentioning

confidence: 95%

“…Previous studies have reported negative (Mann et al, 2005;Ranasinghe et al, 2010) and positive (López-Gatius et al, 2006) effects of milk production on fertility. However, the relationships between milk yield and reproductive performance varies according to the herd level as well as on individual animal level (Löf et al, 2007). For example, Windig et al (2005) reported that herds with high average milk yield had shorter calving to first AI intervals but within herds, cows with high production had longer calving to first AI intervals.…”

Section: Milk Volume and Milk Solidsmentioning

confidence: 99%

“…On the other hand, Dearing et al (2004) monitored six farms in The Netherlands for up to six months before automatic milking systems installation through until 12 months post installation and showed an increase in interval from calving to conception as well as reduced conception rate. On the other hand, Löf et al (2007) reported that automatic milking systems herds in Sweden had shorter calving intervals and shorter intervals from calving to first insemination or to conception compared with conventional milking systems herds. It is possible that the combined effect of individual cow performance, management policy (for example, voluntary waiting period, the method of oestrus detection) and herd size are all factors contributing to the different findings.…”

Section: Introductionmentioning

confidence: 99%

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Factors affecting reproductive performance of dairy cows in a pasture-based, automatic milking system research farm: a retrospective, single-cohort study

et al. 2015

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A retrospective, single-cohort study was conducted to identify production and health factors associated with reproductive performance in a pasture-based, automatic milking system research farm. The calving system of this herd shifted from split calving to year-round calving gradually during the study period. Data from 365 cows with 798 lactations were analysed. Reproductive outcome variables of interest were intervals from calving to first oestrus, to first insemination, and to conception, as well as number of inseminations per conception, probability of submission for insemination by 80 days in milk, probability of conception by 100 days in milk and probability of conception at first insemination. Production factors (milk yield and its composition, milking frequency), record of periparturient disease, parity and season of calving were considered as predictor variables. The associations between predictor and outcome variables were assessed by multivariable linear regression, logistic regression and survival analyses, for quantitative, binary and time-to-event outcomes, respectively. Average milk yield and milking frequency during 100 days in milk were not significantly associated with any of the reproductive measures. The likelihood of conception by 100 days in milk decreased gradually with year of automatic milking system commissioning. Cows calved in autumn were 43% (hazard ratio 1.43, P < 0.05) more likely to conceive than cows calved in summer. Multiparous cows were more likely (P < 0.05) to be recorded for oestrus than primiparous cows. Twinning was negatively associated with the reproductive outcomes measured in the automatic milking system research herd. Milk yield and milking frequency during 100 days in milk had no effect on reproductive measures in the pasture-based, automatic milking system research herd.

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Associations Between Herd Characteristics and Reproductive Efficiency in Dairy Herds

Cited by 36 publications

References 32 publications

Most Probable Producing Ability of Bali Cows for Calving Interval and Calf Growth Performance

Most Probable Producing Ability of Bali Cows for Calving Interval and Calf Growth Performance

Factors associated with 56-day non-return rate in dairy cattle

Factors affecting reproductive performance of dairy cows in a pasture-based, automatic milking system research farm: a retrospective, single-cohort study

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