Factors affecting milking speed in Murciano-Granadina breed goats.
Milk flow during the first minute of milking was analyzed using data from 1,132 Murciano-Granadina breed goats belonging to 17 herds. During the individual lactations, 2 test days were scheduled for recording several milk flow traits, total milk, milk composition (fat and protein percentages), and somatic cell count. Average lag time from teatcup attachment to arrival of milk at the milk claw (T0) was 4.9 s and at the milk meter (T1) was 15.8 s. Average milk flow after 30 s (MF0.5) was 0.29kg/30 s (0 to 1.1kg/30 s) and milk flow at 60 s or milking speed (MF1) was 0.67kg/min (0.1 to 2.1kg/min). Repeatabilities of T0, T1, MF0.5, and MF1 were 0.45, 0.58, 0.62, and 0.68, respectively. The MF1 showed high phenotypic correlation withT1(-0.63) and MF0.5 (0.90), medium values withT0(-0.42) and total milk (0.22), and very low values (-0.04 to -0.12) with fat, protein, and somatic cell count. We found no differences between flows during the first 3 lactations, with a reduction as the lactation number increased. Months in milk since parturition affected MF1, being highest in the first 3mo (0.67-0.71kg/min) and decreasing until the end of lactation (0.58kg/min). The effect of herd-test day was significant for all traits. Inclusion of all these effects for the analysis of milk flow traits is considered necessary.
Centro de Tecnología Animal - IVIA, Apartado 187, 12400 Segorbe, Castellón, Spain.
E
E
Blasco
Centro de Tecnología Animal - IVIA, Apartado 187, 12400 Segorbe, Castellón, Spain.
E A
EA
Gomez
Asociación de Ganaderos de Caprino de Raza Murciano-Granadina de la Comunidad Valenciana (AMURVAL), Calle Santísima Trinidad 1, 46460 Silla, Valencia, Spain.
C
C
Vicente
Center for Animal Disease Modeling and Surveillance, Department of Medicine and Epidemiology, University of California, Davis 95616.
G
G
Vidal
Institut de Ciència i Tecnologia Animal - UPV, Camí de Vera s/n, 46020 València, Spain. Electronic address: cperis@dca.upv.es.
C
C
Peris
D000818:Animals; D001947:Breeding; D003612:Dairying; D005260:Female; D006041:Goats; D007774:Lactation; D008892:Milk; D013997:Time Factors
dairy goat; milk flow; milk yield; milking time