Effect Of Parity And Birth Type On Udder Characteristics And Milk Yield Of West African Dwarf Sheep

Abstract Twelve West African Dwarf WAD sheep four in each of parities one two and three were used to determine effect of parity and birth type on udder characteristics and milk yield during lactation and their phenotypic relationship. Udder length UL udder width UW udder circumference UC udder volume UV teat length TL teat width TW teat circumference TC distance between the teat DBT and teat height from the ground THG of sheep were measured weekly for the twelve weeks of lactation commencing from four days post partum. Result showed that parity and birth type effects on udder characteristics and milk yield were highly significant P 0.01.Twin bearing ewes in the third parity had significantly highest values cm of 9.560.16 9.750.16 42.290.89 2.050.11 1.320.06 3.420.15 488.5934.28 7.260.07 26.460.25 for UL UW UC TL TW TC UV DBT and THG respectively while single bearing ewe in the first parity had the least values cm of 7.220.26 8.260.21 32.171.06 1.220.05 0.870.04 2.330.11 263.6324.36 6.230.07 23.570.38 for UL UW UW UC TL TW TC UV DBT and THG respectively. The UL TL TC TW DBT and THG of single bearing ewes in the third parity had significantly higher values cm of 8.600.09 1.730.11 1.170.05 3.200.11 6.960.08 25.490.28 than twin bearing ewes in the second parity with 8.050.23 1.620.10 1.070.04 2.560.14 6.660.10 25.000.46 for same udder characteristics. Similarly the parity and birth type effect on milk yield was highly significant p 0.01. Twin bearing ewes in the third parity had significantly p 0.01 highest value ml of 249.0914.85 per day followed by single bearing ewes in the third parity with 208.0814.64 ml per day while single bearing ewes in the third parity had the least milk production p of 124.548.79 per day. The correlation coefficient between udder dimensions and milk yield obtained were 0.92 0.79 0.91 0.92 0.86 0.88 0.60 0.08 and -0.24 for UL UW UC TL TW TC UV DBT and THG respectively.