According to the results of studies focusing on the milk yield
parameters of Brown Swiss and Simmental cows, the mean real milk yields
of Brown Swiss cows in their first lactation periods were between 3325 kg and 6219 kg, and their mean 305-day milk yield
was between 3063 kg and 6219 kg (Aktas and Bakir, 2011; Balci, 1996; Cakilli and Gunes, 2007; Cilek and Bakir, 2010; Dag et al., 2003; Inci et al., 2007; Kocak et al., 2008).
However, the parameters used in these models are not adequate for some situations, because some events, like parity number, breed, female age and feeding, can have undesired effects on the milk yield
estimation (ZAMBOM et al., 2005; RODRIGUES et al., 2006).
The milk yield
and composition of the Anatolian water buffaloes were checked on a monthly basis.
is affected by the time of milking with higher values in the morning.
On the other hand, Johnson (1976) attributed that the milk yield
variation was due to climatic factors is among 3-10%.
Where [y.sub.ijkl] is the milk yield
of the Ith animal of the ith herdyear-season, recorded at the jth calving age and the kth DIM; HY[S.sub.i] is the effect of the ith herd-year-season (i = 1 to 2,483); [age.sub.j] is the effect of the jth calving age (j = 1 to 2); DI[M.sub.k] is the effect of the kth DIM (k = 1 to 50); [a.sub.l] and [p.sub.l] are the effects of the additive genetic merit and permanent environment of the cow l (l = 1 to 56,132); f(i) is the heat stress function for the herd-test-day (HTD); [v.sub.l] and [q.sub.l] are the additive and permanent environmental effects of heat tolerance on cow l, respectively; and [e.sub.ijkl] is the residual effect.
Correlations between fat or protein percentages and milk yield
were performed on a breed-group basis (Table 2).
While a negative correlation between an increased SCC during the first month of the first lactation and longevity has been proven, suggestions to further investigation of lifetime milk yield
are still to be made.
The animals were grouped according to calving order (first, second, third, and fourth calving) at different days in milk (DIM): early (1-90 DIM), middle (91-180 DIM), and end of lactation (over 181 DIM) for comparing milk yield
, milk composition, and blood metabolic profile between the calving orders within the same lactation period.
The T2 and T3 differed non-significantly (p<0.05) for milk yield
The overall lactation milk yield
was 2435 kg in 280 days with 3.89 % fat.
Result for simple correlation was observed low to high and positive for lactation length x milk yield
, milk yield
x birth weight and birth weight vs lactation length, while the genetic correlation was observed moderate to low between milk yield
and lactation length and birth weight x lactation length, whereas the genetic correlation was found negative between birth weight x milk yield