Comparative Efficiency of Various Mathematical Functions of Lactation Curve in Gir Cattle using Weekly Milk Yields

Savaliya, B. D.; SParikh, Suryakant; Ahlawat, A. R.; Makwana, R. B.

doi:10.5455/ijlr.20170405041410

Int. J. Livest. Res.

2017

DOI: 10.5455/ijlr.20170405041410

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Comparative Efficiency of Various Mathematical Functions of Lactation Curve in Gir Cattle using Weekly Milk Yields

B. D. Savaliya¹,

Suryakant SParikh²,

A. R. Ahlawat³

et al.

Abstract: The present investigation was conducted to compare relative efficiency of four lactation curve models in Gir cattle. This study was carried out on 1246 normal lactation records (1-6 parity) pertaining to 357 Gir cows spread over 15 years (2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015)

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2022

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“…935, 1633.173, 1540.196, 1719.196, 1711.945 and 1620.361 respectively. Gamma-type function was given as the best fitting model adjudged in earlier studies by Bangar and Verma (2017) and Savaliya et al (2017).…”

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confidence: 99%

Test day yield, lactation curve and production potential of Gir cattle under hot and humid conditions of Tamil Nadu

VENKATARAMANAN¹,

Sundaram²,

AMBIKE³

et al. 2022

Indian J of Anim Sci

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Test day milk yield records (5130), milk production and milk composition traits from 19 lactations of Gir cows collected for two years (2019 and 2020) were used to understand the performance of Gir breed in hot and humid conditions of Tamil Nadu. Different lactation curve models were used for modelling test day records and model diagnostics like adjusted R-square, BIC and RMSE were used to obtain the model of best fit. The mean test day yield, fat per cent, SNF (%), total milk yield, peak yield, days to attain peak yield and calving interval observed were 5.78 kg, 5.05%, 7.65%, 1507 kg, 9.23 kg, 46.5 days and 447 days respectively. Ali and Shaeffer model offered the best fit for lactation curve in Gir cows. Mahadevan method and Gamma function were used to calculate the persistency of milk yield which was obtained as 1.33 and 6.348 respectively. Results of the study indicated that Gir cattle were able to adapt themselves through maintenance of reproductive traits comparable with that of the native tract but the new humid environment has caused a slight decrease in the performance of milk production traits.

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mentioning

confidence: 99%

Test day yield, lactation curve and production potential of Gir cattle under hot and humid conditions of Tamil Nadu

VENKATARAMANAN¹,

Sundaram²,

AMBIKE³

et al. 2022

Indian J of Anim Sci

View full text Add to dashboard Cite

show abstract

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Comparative Efficiency of Various Mathematical Functions of Lactation Curve in Gir Cattle using Weekly Milk Yields

Cited by 1 publication

References 2 publications

Test day yield, lactation curve and production potential of Gir cattle under hot and humid conditions of Tamil Nadu

Test day yield, lactation curve and production potential of Gir cattle under hot and humid conditions of Tamil Nadu

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