Body condition and suckling as factors influencing the duration of postpartum anestrus in cattle: a review

Montiel, F.; Ahuja, C.S.

doi:10.1016/j.anireprosci.2003.11.001

Cited by 165 publications

(143 citation statements)

References 147 publications

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“…Results suggest that much of the genetic variance in PPAI is the result of whether or not the cow cycled before weaning. Primary reasons for delayed postpartum resumption of cycling are low body condition (Rudder et al, 1985) and the effect of suckling (Montiel and Ahuja, 2005). Until the complete dataset from six calving opportunities has been analysed, firm recommendations about which trait(s) has the most potential for use in breeding programmes cannot be made.…”

Section: Component Traits Of Female Reproductionmentioning

confidence: 99%

Importance of adaptation and genotype × environment interactions in tropical beef breeding systems

Burrow

2012

Animal

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This paper examines the relative importance of productive and adaptive traits in beef breeding systems based on Bos taurus and tropically adapted breeds across temperate and (sub)tropical environments. In the (sub)tropics, differences that exist between breeds in temperate environments are masked by the effects of environmental stressors. Hence in tropical environments, breeds are best categorised into breed types to compare their performance across environments. Because of the presence of environmental stressors, there are more sources of genetic variation in tropical breeding programmes. It is therefore necessary to examine the genetic basis of productive and adaptive traits for breeding programmes in those environments. This paper reviews the heritabilities and genetic relationships between economically important productive and adaptive traits relevant to (sub)tropical breeding programmes. It is concluded that it is possible to simultaneously genetically improve productive and adaptive traits in tropically adapted breeds of beef cattle grazed in tropical environments without serious detrimental consequences for either adaptation or production. However, breed-specific parameters are required for genetic evaluations. The paper also reviews the magnitude of genotype 3 environment (G 3 E) interactions impacting on production and adaptation of cattle, where 'genotype' is defined as breed (within a crossbreeding system), sire within breed (in a within-breed selection programme) or associations between economically important traits and single nucleotide polymorphisms (SNPs -within a marker-assisted selection programme). It is concluded that re-ranking of breeds across environments is best managed by the use of the breed type(s) best suited to the particular production environment. Re-ranking of sires across environments is apparent in poorly adapted breed types across extreme tropical and temperate environments or where breeding animals are selected in a temperate environment for use in the (sub)tropics. However, G 3 E interactions are unlikely to be of major importance in tropically adapted beef cattle grazed in either temperate or (sub)tropical environments, although sex 3 environment interactions may provide new opportunities for differentially selecting to simultaneously improve steer performance in benign environments and female performance in harsher environments. Early evidence suggests that re-ranking of SNPs occurs across temperate and tropical environments, although their magnitude is still to be confirmed in well-designed experiments. The major limitation to genetic improvement of beef cattle over the next decade is likely to be a deficiency of large numbers of accurately recorded phenotypes for most productive and adaptive traits and, in particular, for difficult-to-measure adaptive traits such as resistance to disease and environmental stressors.

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Section: Component Traits Of Female Reproductionmentioning

confidence: 99%

Importance of adaptation and genotype × environment interactions in tropical beef breeding systems

Burrow

2012

Animal

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“…The longer postpartum anoestrus interval (P<0.01) for cows calved in the spring season in TFS, as compared to in the summer, may be due to fodder shortage (Montiel and Ahuja 2005) during the winter. In late spring, cows in TFS face additional stress, with the transhumance to the uplands causing a longer postpartum anoestrus interval.…”

Section: Discussionmentioning

confidence: 99%

Effect of management on reproductive performances of the Achai cattle in the Hindu Kush (Northern Pakistan)

Saleem¹,

Rahim

Rueff

et al. 2012

Trop Anim Health Prod

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This study evaluates the effect of management on the undocumented Achai cattle reproductive performance in transhumant farming systems (TFS) and in sedentary farming systems (SFS) in northwestern Pakistan. Data were collected from 172 households in TFS and 270 households in SFS to analyze the effect of farming systems, parity, and calving season on key reproductive traits. The results show that farming systems significantly affect pubertal age, while parity has no significant effect on any of the key traits. The calving season significantly affects the postpartum anoestrus interval in TFS only. More than 50% of the cows in both systems have postpartum anoestrus intervals and calving intervals within the recommended values for cows in tropical countries. Achai cows have high first-service conception rates (70% and 71% for TFS and SFS, respectively) and require a relatively small number of services per conception (1.53±0.06 and 1.48± 0.05 SE for TFS and SFS, respectively). This local breed thus warrants conservation under both farming systems.

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“…BCS has been used routinely in dairy cows to improve the distribution of food resources for the different categories of females and to help with the disposal of cows due to reproductive failures (Montiel and Ahuja, 2004). BCS measurement is easy, fast, inexpensive and non-invasive (Machado et al, 2008) and due to these useful characteristics has been developed as an indirect measure of the body reserves of an animal, and consequently of its reproductive potential.…”

Section: Introductionmentioning

confidence: 99%

Body condition score of Nellore beef cows: a heritable measure to improve the selection of reproductive and maternal traits

Fernandes

Neves

Carvalheiro

et al. 2015

Animal

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Despite the economic importance of beef cattle production in Brazil, female reproductive performance, which is strongly associated with production efficiency, is not included in the selection index of most breeding programmes due to low heritability and difficulty in measure. The body condition score (BCS) could be used as an indicator of these traits. However, so far little is known about the feasibility of using BCS as a selection tool for reproductive performance in beef cattle. In this study, we investigated the sources of variation in the BCS of Nellore beef cows, quantified its association with reproductive and maternal traits and estimated its heritability. BCS was analysed using a logistic model that included the following effects: contemporary group at weaning, cow weight and hip height, calving order, reconception together with the weight and scores of conformation and early finishing assigned to calves at weaning. In the genetic analysis, variance components of BCS were estimated through Bayesian inference by fitting an animal model that also included the aforementioned effects. The results showed that BCS was significantly associated with all of the reproductive and maternal variables analysed. The estimated posterior mean of heritability of BCS was 0.24 (highest posterior density interval at 95%: 0.093 to 0.385), indicating an involvement of additive gene action in its determination. The present findings show that BCS can be used as a selection criterion for Nellore females.

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Body condition and suckling as factors influencing the duration of postpartum anestrus in cattle: a review

Cited by 165 publications

References 147 publications

Importance of adaptation and genotype × environment interactions in tropical beef breeding systems

Importance of adaptation and genotype × environment interactions in tropical beef breeding systems

Effect of management on reproductive performances of the Achai cattle in the Hindu Kush (Northern Pakistan)

Body condition score of Nellore beef cows: a heritable measure to improve the selection of reproductive and maternal traits

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