Open Access
Research
(Published
online: 24-06-2016)
18.
Optimization of dry period in Karan Fries
cow -
K. Puhle Japheth, R. K. Mehla, Mahendra Singh, A. K. Gupta,
Ramendra Das, Pranay Bharti and T. Chandrasekar
Veterinary World, 9(6): 648-652
doi:
10.14202/vetworld.2016.648-652
K. Puhle Japheth:
Division of Livestock Production Management, ICAR-National Dairy
Research Institute, Karnal - 132 001, Haryana, India;
puhleveto7@gmail.com
R. K. Mehla:
Division of Livestock Production Management, ICAR-National Dairy
Research Institute, Karnal - 132 001, Haryana, India; mehla1954@gmail.com
Mahendra Singh:
Division of Dairy Cattle Physiology, ICAR-National Dairy
Research Institute, Karnal - 132 001, Haryana, India; chhokar.ms@gmail.com
A. K. Gupta:
Division of Dairy Cattle Breeding, ICAR-National Dairy Research
Institute, Karnal - 132 001, Haryana, India; guptaak2009@gmail.com
Ramendra Das:
Division of Dairy Cattle Breeding, ICAR-National Dairy Research
Institute, Karnal - 132 001, Haryana, India; ramenvets@gmail.com
Pranay Bharti:
Division of Livestock Production Management, ICAR-National Dairy
Research Institute, Karnal - 132 001, Haryana, India;
dr12pranay@gmail.com
T. Chandrasekar:
Division of Livestock Production Management, ICAR-National Dairy
Research Institute, Karnal - 132 001, Haryana, India;
chandrulpm1986@gmail.com
Received: 02-02-2016, Accepted: 20-05-2016, Published online:
24-06-2016
Corresponding author:
K. Puhle Japheth, e-mail: puhleveto7@gmail.com
Citation:
Japheth KP, Mehla RK, Singh M, Gupta AK, Das R, Bharti P,
Chandrasekar T (2016) Optimization of dry period in Karan Fries
cow, Veterinary World, 9(6): 648-652.
Abstract
Aim:
The objective of this study was to optimize dry period (DP)
length that can maximize the production across adjacent
lactations and overall lifetime yield.
Materials and Methods:
Performance records with respect to DP spread over a period of
15-year in Karan Fries (KF) cattle maintained at Livestock
Research Centre (National Dairy Research Institute), were
collected for the study. Data of 681 KF cows were analyzed by
least square technique to examine the effect of non-genetic
factors on DP. Season of calving was classified into four
seasons: Winter season (December-March), summer season
(April-June), rainy season (July-September), and autumn season
(October-November); period of calving into five periods:
1998-2000 (1-period), 2001-2003 (II-period), 2004-2006
(III-period), 2007-2009 (IV-period), and 2010-2012 (V-period),
and parity into six parities, i.e., 1st, 2nd, 3rd, 4th, 5th, and
˃6th
parities to see the effect of non-genetic factors on DP.
Results:
Period of calving, season of calving, and parity did not affect
the DP significantly (p<0.05). The overall least square mean of
DP was 67.93±2.12 days. For the optimization of DP with regard
to milk productivity, analysis was carried out by class interval
method. DP was classified into eight classes (˂22,
23-45, 46-67, 68-89, 90-111, 112-133, 134-155, and
˃156
days), and optimum level was obtained at 46-67 days (3rd class)
with the following respective milk yield (MY) of 305 daily MY
(4016.44±43.68 kg), total MY (4704.21±61.51 kg), MY per day of
lactation length (13.03±0.13 kg), and MY per day of calving
interval (11.68±0.41 kg).
Conclusion:
From the study, it was concluded that this optimal DP length
(46-67 days) is suitable for maximizing the production. Hence,
one should aim to dry off pregnant cows to achieve a DP of
appropriate length to enhance productivity in the next
lactation, as very short and very long DP reduces the economic
profitability in dairy animals.
Keywords:
dry period, economic trait, Karan Fries cow, non-genetic
factors, optimization.
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