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Research
(Published
online: 18-10-2014)
15.
Comparison of standard lactation curve
models using fortnightly milk records in Frieswal cattle -
Amit Kumar Dohare, B. Singh, Med Ram Verma, Bangkeng Perme,
Vijay Bahadur Sharma, Neha Gupta and Shashank Kshandakar
Veterinary World, 7(10): 831-834
doi:
10.14202/vetworld.2014.831-834
Amit
Kumar Dohare:
Division of Livestock Economics, Statistics & Information
Technology, Indian Veterinary Research Institute, Izatnagar,
Bareilly, Uttar Pradesh, India;
dr.doharevet@gmail.com
B.
Singh: Division of
Livestock Economics, Statistics & Information Technology, Indian
Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh,
India; bsingh@ivri.res.in
Med Ram
Verma: Division of
Livestock Economics, Statistics & Information Technology, Indian
Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh,
India;
medramverma@rediffmail.com
Bangkeng Perme:
Division of Animal Nutrition, Indian Veterinary Research
Institute, Izatnagar, Bareilly, Uttar Pradesh, India;
bangkeng.perme@gmail.com
Vijay
Bahadur Sharma:
Division of Livestock Economics, Statistics & Information
Technology, Indian Veterinary Research Institute, Izatnagar,
Bareilly, Uttar Pradesh, India;
drvijaybharadwaj@gmail.com
Neha
Gupta: Division of
Livestock Economics, Statistics & Information Technology, Indian
Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh,
India;
nehaguptaivri2012@gmail.com
Shashank Kshandakar:
Division of Livestock
Economics, Statistics & Information Technology, Indian Veterinary
Research Institute, Izatnagar, Bareilly, Uttar Pradesh, India;
skshandakar@gmail.com
Received:
31-07-2014, Revised: 10-09-2014, Accepted: 16-09-2014, Published
online: 18-10-2014
Corresponding author:
Amit Kumar Dohare, e-mail: dr.doharevet@gmail.com
Abstract
Aim:
The aim was to compare standard lactation curve models using
fortnightly milk records in Frieswal cattle.
Materials and Methods: A total of 2904 fortnightly milk yield
(FMY) records from 132 Frieswal cattle maintained at Military
Farm, Bareilly, Uttar Pradesh were taken for study. The Wood (WD),
Morant and Gnanasakthy (MG), Mitscherlich x Exponential (ME), and
Wilmink (WK) models were fitted on average FMY (AFMY) by nonlinear
regression using statistical package SAS 9.3 version. The goodness
of fit of models was judged by the adjusted coefficient of
determination (Adj. R2) and root mean square error.
Results: The AFMY ranges from 127.09 kg (first fortnight) to
110.04 kg (last fortnight) with peak fortnight yield of 189.51 kg
and peak period at fourth fortnight. Predicted peak yield by
different models ranges from 182.7 to 190.2 kg. The herd average
milk yield was predicted with a high degree of accuracy (Adj.
R2>92%) by all models with the maximum accuracy (Adj. R2=99.20%)
obtained by ME model followed by MG (Adj. R2=98.8%) and WK model
(Adj. R2=96.0%).
Conclusion: The ME model provided best fit for FMY data in
Frieswal cattle followed by WK and MG model, whereas WD model
fitted least.
Keywords: Frieswal cattle, fortnightly milk yield, lactation
curve model, peak yield.
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