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R esearch
(Published online:
31-05-2015)
23.
Study of short lactation in Sahiwal cattle at organized farm
-
U. S.
Narwaria, R. K. Mehla, K. K. Verma, S. S. Lathwal, Rajnarayan
Yadav and A. K. Verma
Veterinary World, 8(5): 690-694
doi:
10.14202/vetworld.2015.690-694
U. S. Narwaria:
Livestock Production and Management Section, National Dairy
Research Institute, Karnal, Haryana - 132 001, India;
bnkupendra@gmail.com
R. K. Mehla: Livestock
Production and Management Section, National Dairy Research
Institute, Karnal, Haryana - 132 001, India;
mehla@ndri.res.in
K. K. Verma: Livestock
Production and Management Section, National Dairy Research
Institute, Karnal, Haryana - 132 001, India;
drkkvermavet@gmail.com
S. S. Lathwal:
Livestock Production and Management Section, National Dairy
Research Institute, Karnal, Haryana - 132 001, India;
lathwal@gmail.com
Rajnarayan Yadav:
Livestock Production and Management Section, National Dairy
Research Institute, Karnal, Haryana - 132 001, India;
dr.rajnarayanndri@gmail.com
A. K. Verma: Livestock
Production and Management Section, National Dairy Research
Institute, Karnal, Haryana - 132 001, India;
vetadesh87@gmail.com
Received:
15-01-2015, Revised:
22-04-2015, Accepted:
27-04-2015, Published
online: 31-05-2015
Corresponding author:
K. K. Verma, e-mail: drkkvermavet@gmail.com
Citation:
Narwaria US, Mehla RK, Verma KK, Lathwal SS, Yadav R, Verma AK
(2015) Study of short lactation in Sahiwal cattle at organized
farm, Veterinary World 8(5):690-694.
Abstract
Aim: The aim was to study
the associated factors and extent of short lactations in Sahiwal
cattle maintained under organized herd.
Materials and Methods: The present study was conducted on
Sahiwal cattle (n=530), utilizing 1724 lactation records with
respect to lactation length (LL), spread over a period of 15 years
(1997-2011), maintained at Livestock Research Center, National
Dairy Research Institute, Karnal. Observations of LL were analyzed
by descriptive statistical analysis in order to know the extent of
short lactation of animals in the herd. Paternal Half sib method
was used to estimate the genetic parameters, i.e., heritability,
genetic, and phenotypic correlation. The influence of various
non-genetic factors (season of calving, the period of calving,
parity, type of calving, and season of drying) on LL was studied
by least squares analysis of variance technique.
Results: The least squares means for LL was found to be
215.83±3.08 days. Only 32.48% of total lactation records were fell
in the range of 251-350 days of LL, while more than three-fourth
(76%) of total observations were failed to reach the standard
level of 305 milking days. LL class ranges from 251 to 300 days
accommodated maximum number of observations (19.2%). The
heritability estimate of LL was 0.22±0.07. Positive correlations
were found between LL and service period, LL and 305 or less days
milk yield, LL and calving interval; whereas dry period was
negatively correlated with the LL. The least squares analysis had
shown that LL was significantly (p<0.01) influenced by the period
of calving, type of calving, and season of drying. Significantly
higher LL (276.50±7.21 days) was found in animals calved in the
first period than those calved in other periods. The cows dried
during summer season had the shortest LL (188.48±7.68 days) as
compared to other seasons.
Conclusion: Present findings regarding short lactations
occurrence may be alarming for the indigenous herd, demanding
comprehensive study with the larger data set. Since LL was
influenced by various environmental factors suggesting better
managerial tools, besides special attention on the milch animals
going to dry during the summer season.
Keywords: correlation, non-genetic factors, Sahiwal cattle,
short lactation.
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