REPRODUCTION - Facultad de Ciencias Veterinarias

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REPRODUCTION
with the females throughout the experiment. The animals were milked once a day with milking machine, without calf. The
milk was automatically measured (De Laval milking Marc 5), weekly, from the first week after calving until the end of
lactation. For this study only the production of the first 60 days of lactation was considered. To assess the correlations
between MP60d, UIP and ICFE analysis of the Pearson correlation was performed.
RESULTS AND DISCUSSION
As there were no significant differences between primiparous and multiparous cows in mean IUP and mean ICFE (p =
0.05) (Table 1), all animals were considered independently of the group for analysis of correlation. The IUP and ICFE were
correlated (r=0.61, P < 0.05), indicating that the animals with a higher IUP had a greater ICFE. Similar correlation (r =
0.53, P 0.05). These results are consistent with those reported for Murrah buffaloes with low milk
production 6 . However, in a review 7 , studies were reported without and with correlation between these parameters where
animals with higher milk production showed a longer UIP than those with lower production. There were no significant
correlations between MP60d and ICFE. (r = 0.10, p >0.05), it agrees with those reported for Murrah buffaloes with low
milk production 4 . In review 8 there was reported a correlation between these two parameters only when the milk yield was
up to 8kg/day.
In conclusion, there was a significant correlation between UIP and ICFE. This correlation is moderate, due the
great variability in the range of animals presenting the first estrus, indicating that there are other factors involving this
parameter. There was no correlation between MP60d and the UIP, as well as no correlation between the MP60d and the
ICFE under the conditions of this work.
Proceedings 9 th World Buffalo Congress