Use of milk urea nitrogen (MUN) factore to improve dairy cow production rate.
2009
Nuruzi, Mohammad | Abazari, Mehran | Pajaz, Mahdi | Ashrafi Zadeh, Gholam Reza | Qanbari, Ahmad
The hypothesis of this study was that providing farmers with information regarding their herd's milk urea nitrogen (MUN) would result in more accurate feed management, lower feed cost and a change in MUN toward target values. Milk samples of high and low yield dairy cows' and bulk tanks in thirty Mashhad milk producers were tested for MUN and crude protein each month for six months from last month of spring until last month of fall. Farms divided into two equal groups. The first group of dairy Farms (n=١٥) was provided with the results of their MUN analysis each month along with interpretive information. Nitrogen intake, urinary and fecal N and efficiency of feed N utilization was estimated from survey data and milk analysis for each herd, depend on milk samples of high and low yield dairy cows and bulk tanks. Survey results indicated that the average of MUN and efficiency of feed N utilization for the first group of farms were lower and higher respectively than second group, significantly. The average MUN across all farms in the study increased in the last of summer, but the increase was lower for farms receiving MUN results than others farms, significantly. In contrast, the average feed N utilization was decreased for all farms in the last of summer. But except low yield dairy cows, the average feed N utilization for first group was higher than second in that time, significantly. The farms which receiving MUN results having lower feed cost than other farms, significantly.
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