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R esearch
(Published online:
12-03-2015)
11.
Assessment of expected breeding values for fertility traits of
Murrah buffaloes under subtropical climate
-
Soumya
Dash, A. K. Chakravarty, Avtar Singh, Pushp Raj Shivahre, Arpan
Upadhyay, Vaishali Sah and K. Mahesh Singh
Veterinary World, 8(3): 320-325
doi:
10.14202/vetworld.2015.320-325
Soumya
Dash:
Dairy Cattle Breeding Division, National Dairy Research Institute,
Karnal, Haryana, India; dr.soumya10@gmail.com
A. K.
Chakravarty:
Dairy Cattle Breeding Division, National Dairy Research Institute,
Karnal, Haryana, India; ak_chakravarty@yahoo.co.in
Avtar
Singh:
Dairy Cattle Breeding Division, National Dairy Research Institute,
Karnal, Haryana, India; avtar54@gmail.com
Pushp
Raj Shivahre:
Dairy Cattle Breeding Division, National Dairy Research Institute,
Karnal, Haryana, India; drpro6@gmail.com
Arpan
Upadhyay:
Dairy Cattle Breeding Division, National Dairy Research Institute,
Karnal, Haryana, India; upadhyay.arpan@gmail.com
Vaishali Sah:
Division of Animal Genetics, Indian Veterinary Research Institute,
Izatnagar, Bareilly, Uttar Pradesh, India; vaishalisah.sah@gmail.com
K.
Mahesh Singh: Dairy Cattle Breeding Division, National Dairy
Research Institute, Karnal, Haryana, India;
maheshsngh7@gmail.com
Received: 14-10-2014, Revised: 25-01-2015, Accepted: 02-02-2015,
Published online: 12-03-2015
Corresponding author:
Soumya Dash, e-mail: dr.soumya10@gmail.com
Citation:
Dash S, Chakravarty
AK, Singh A, Shivahre PR, Upadhyay A, Sah V, Singh KM (2015)
Assessment of expected breeding values for fertility traits of
Murrah buffaloes under subtropical climate, Veterinary World
8(3):320-325.
Abstract
Aim: The aim of the present study was to
assess the influence of temperature and humidity prevalent under
subtropical climate on the breeding values for fertility traits
viz. service period (SP), pregnancy rate (PR) and conception
rate (CR) of Murrah buffaloes in National Dairy Research Institute
(NDRI) herd.
Materials and Methods: Fertility data on 1379 records of 581
Murrah buffaloes spread over four lactations and climatic
parameters viz. dry bulb temperature and relative humidity
(RH) spanned over 20 years (1993-2012) were collected from NDRI
and Central Soil and Salinity Research Institute, Karnal, India.
Monthly average temperature humidity index (THI) values were
estimated. Threshold THI value affecting fertility traits was
identified by fixed least-squares model analysis. Three zones of
non-heat stress, heat stress and critical heat stress zones were
developed in a year. The genetic parameters heritablility
(h2) and repeatability (r) of each fertility trait were
estimated. Genetic evaluation of Murrah buffaloes was performed in
each zone with respect to their expected breeding values (EBV) for
fertility traits.
Results:
Effect of THI was found
significant (p<0.001) on all fertility traits with threshold THI
value identified as 75. Based on THI values, a year was classified
into three zones: Non heat stress zone(THI 56.71-73.21), HSZ (THI
75.39-81.60) and critical HSZ (THI 80.27-81.60). The EBVfor SP,
PR, CR were estimated as 138.57 days, 0.362 and 69.02% in non-HSZ
while in HSZ EBV were found as 139.62 days, 0.358 and 68.81%,
respectively. EBV for SP was increased to 140.92 days and for PR
and CR, it was declined to 0.357 and 68.71% in critical HSZ.
Conclusion:
The negative effect of THI
was observed on EBV of fertility traits under the non-HSZ and
critical HSZ Thus, the influence of THI should be adjusted before
estimating the breeding values for fertility traits in Murrah
buffaloes.
Keywords:
critical heat stress zone,
expected breeding value, murrah buffaloes, temperature humidity
index.
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