Vol. 11, Special Issue 7 (2022)

Author(s):
Subhita, M Nehara, U Pannu, M Bairwa and MK Meena

Abstract:
The present study was carried out to determine the effect of genetic and non-genetic factors on first lactation weekly test day milk yields of Tharparkar cattle maintained at Livestock Research Station (LRS), Beechwal, Bikaner. The overall least squares means for 43 individual weekly test day milk yields varied from 3.58 ± 0.12 kg (WTD1) to 7.47 ± 0.29 kg (WTD9). The season of calving had highly significant (P≤0.01) effect on WTD6. However, significant (P≤0.05) effect was found on WTD5, WTD18, WTD19, WTD25, and WTD41. The period of calving had highly significant (P≤0.01) effect on WTD34. However, significant (P≤0.05) effect was found on WTD19, WTD31, WTD32, WTD36, and WTD43. The sire had highly significant (P≤0.01) effect on WTD32, WTD33 and WTD34. However, significant (P≤0.05) effect was found on WTD1, WTD2, WTD30, WTD31, and WTD35. The regression of age at first calving was found highly significant (P≤0.01) on WTD24 and WTD35. However, significant (P≤0.05) effect was found on WTD6, WTD20, WTDY25-WTD29, WTD31-WTD34, and WTD41.