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Milk Production of dairy goat is influenced by genetic and non-genetic factors. Crossbred dairy goat of Sapera (50% Saanen, 50% PE) has been formed by Indonesian Research Institute for Animal Production (IRIAP). Genetic improvement of milk production is the main trait considered in forming Sapera goat, so the effects of non-genetic factors on milk production should be investigated. Effects of Litter size, kidding age, mating weight and kidding weight were examined on weekly cumulative milk yields (week 1-14) in Generation 1 (G1) Sapera goat (28 heads) at RIAP. General Linear Model for unbalanced data was used to study the effects of those four factors, while mean differences among sub-factors were tested by Duncan test. The G1 Sapera does had kidding age, litter size, mating weight, and kidding weight successively 4.22±1.45 yrs old, 2.07±0.55, 49.0±11.43 kg, and 44.4±11.75 kg. Higher litter sizes resulted more milk yields, but litter size effects decreased by the lengthening lactation. Kidding age at ≥ 5 yrs old produced higher milk yileds than the younger does (3 and 4 years old). Mating weight did not affect on milk yields, while does having kidding weight ≥ 70 kg resulted lower milk than other weights. Considerable variation for various partial cumulative milk yields among G1 Sapera does has a good indication for possible selection on milk production in Sapera dairy goat.