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A Comparison of the Milking Characteristics of Teatcup Liners

Authors: I. McD. Gibb and G.A. Mein

Abstract:

The milking characteristics of ten types of teatcup liner (8 commercial and 2 experimental types) in new condition were compared for strip yield, machine time, and incidence of slipping and falling. Significant differences were found in all milking characteristics using a group of 20 cows in a 10 x 10 Latin square over a 20 day period. Strip yield ranged from 0.26 to 0.62 kg, between 3 and 7.5% of the total yield. The slowest liner took 22% longer than the fastest to milk cows out. The most stable liner slipped or fell at a rate of 4 per hundred cow milkings, compared with 59 per hundred for the least stable.

Eight of the liners were selected to form three pairs differing mainly in single physical characteristics (presence or absence of knobs on the inner surface of the liner barrel, presence of absence of mouthpiece petals and presence or absence of a plastic strip within the barrel of the liner). An experimental knobbed liner took significantly longer to milk out and fell more often than its plain counterpart. Insertion of a plastic strip caused another liner to fall more often. Mouthpiece petals caused a reduction in slips and falls, but increased machine time.

Five of the ten types of liners were aged in commercial use (approximately 1800 cow milkings in 5 months use) and their subsequent milking characteristics then compared with their new counter parts on the same group of 20 cows for 20 days in late lactation in a 10 x 10 Latin square. The group of aged liners slipped or fell less often than the same group of liners in new condition. Other characteristics were not significantly different between the new and aged liners.

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