Altaf Hussain’s research while affiliated with National Dairy Research Institute and other places

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Publications (2)


Least-squares means of age at first calving, first 305 day milk yield, first lactation length and milk yield per day of lactation length.
Effect of non-genetic factors on first lactation production and reproduction traits in Tharparkar cattle
  • Article
  • Full-text available

August 2015

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132 Reads

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10 Citations

Indian Journal of Animal Research

Altaf Hussain

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A.K. Gupta

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[...]

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Shahid Ahmad

The present investigation was earned out with the objective of performance appraisal of Tharparkar cattle with respect to production and reproduction traits. Data were collected on 230 cows over a period of 50 years (1959-2011), maintained at NDRI, Karnal. The overall least-squares means for first lactation 305 day milk yield (F305Y), First lactation total milk yield (FTMY), first lactation length(FLL), First lactation total milk yield per day of first lactation length (TMY/FLL), First lactation dry period (FDP), First lactation service period (FSP), First lactation calving interval (FCI) and First lactation total milk yield per day of first lactation calving interval (TMY/FCI) were found to be 1618.47 +/- 49.39 (kg), 1822.65 +/- 70.2 (kg), 321.47 +/- 8.87 (days), 5.65 +/- 0.16 (kg/day), 99.80 +/- 10.62 (days), 151.13 +/- 16.27 (days), 436.75 +/- 16.18 (days), 4.59 +/- 0.20 (kg/day). Further, the last squares analysis revealed no significant effect of season of calving whereas, the effect of period of calving was found to be significant on first lactation production and reproduction traits.

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Figure-1: Comparison between the mean expected breeding values and the average phenotypic values for production and fertility traits.  
Evaluation of efficiency of sire model and animal model in Holstein Friesian crossbred cattle considering first lactation production and fertility traits

November 2014

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314 Reads

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13 Citations

Veterinary World

Aim: The present investigation was conducted for evaluating the efficacy of estimating breeding values (BVs) using univariate animal model in comparison to sire model. The various parameters considered for evaluating the efficiency of both linear models were coefficient of determination (R2), coefficient of variation (CV), within sire variance or error variance and spearman’s rank correlation estimates. Materials and Methods: Data for the present investigation were spread over a period of 34 years from 1978 to 2012 and consisted of a total of 1988 lactation records of Holstein Friesian crossbred cows sired by 186 crossbred bulls. Results: The percentage of sires having BV (estimated by animal model) more than the average BV for the traits viz. age at first calving (AFC), first service period (FSP), first lactation length (FLL), first calving interval (FCI), first lactation 305 day milk yield (F305MY), first lactation total milk yield (FTMY), milk yield per day of first lactation length (MY/FLL) and milk yield per day of first calving interval (MY/FCI) were 48.05, 49.39, 55.07, 49.21, 50.00, 51.39, 48.67, 50.39%, respectively. The animal model had higher R2, lower CV and error variance for most of the fertility and production traits. The spearman’s rank correlation estimates indicated similarity of rankings by both the linear models as the animal model is an improvement of sire model. Conclusion: Animal model had a wider range of BVs indicating the greater differentiating ability of the model. Based on R2, CV and error variance animal model was found to be superior in comparison to sire model.

Citations (2)


... Non-genetic factors are those effects that are not part of the genetic make-up of an animal (Nyamushamba et al., 2014). Hussain et al. (2015) stated that evaluation of the influence of non-genetic factors on milk production traits was important for formulating breeding improvement programme for dairy cattle (Hussain et al., 2015). Milk consumption is very high per person per year worldwide, and the consumption is bound to go up due to increased urbanization and wages (Hoka et al., 2019). ...

Reference:

A systematic review of effect of calving season and parity as non-genetic factors on milk production traits of cattle
Effect of non-genetic factors on first lactation production and reproduction traits in Tharparkar cattle

Indian Journal of Animal Research

... However, linear models are favoured for international evaluations due to their simpler computational demands (VanRaden et al., 2010). Animal models have become the international base for estimating breeding values (Dash et al., 2014). It enables the evaluation of all animals within the herd. ...

Evaluation of efficiency of sire model and animal model in Holstein Friesian crossbred cattle considering first lactation production and fertility traits

Veterinary World