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Seasonal Stress Affects Reproductive and Lactation Traits in Dairy Cattle with Various Levels of Exotic Blood and Parities under Subtropical Condition

Seasonal Stress Affects Reproductive and Lactation Traits in Dairy Cattle with Various Levels of Exotic Blood and Parities under Subtropical Condition

Ihsanullah*, Muhammad Subhan Qureshi, Sohail Akhtar and Syed Muhammad Suhail

Department of Livestock Management, Animal Breeding and Genetics, Faculty of Animal Husbandry and Veterinary Sciences, The University of Agriculture, Peshawar, Khyber Pakhtunkhwa, Pakistan

*      Corresponding author: drihsanullah1965@gmail.com

 

Fig. 1.

Effect of year of calving on age at first calving (AFC, solid lines; y = 6.6048x + 415.47; R² =0.39 ) and calving interval (CI, dashed lines, y = 63.451x + 827.42; R² = 0.73) in dairy cattle.

Fig. 2.

Effect of parity on 305 days milk yield (solid squares; y = 1.9164x + 2547.5; R² = 0.01) and lactation length (solid circles; y = 3.5023x + 254.57; R² = 0.48) in dairy cattle.

Fig. 3.

Changes in 305 days milk yield with the increasing parities in crossbred dairy cows (y = -6.340x2 + 58.97x + 2452, R² = 0.49)

Pakistan Journal of Zoology

December

Vol. 51, Iss. 6, Pages 1999-2399

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