Twenty Jersey and 12 Friesian cows were individually offered freshly cut pastures that had received either 100-150 kg nitrogen (N)/ha (HN) or 25 kg N/ha (LN) as urea, either ad lib. or restricted to 70% of ad lib. Treatments were imposed for 2 consecutive 14-day periods during September and October 1993. Effects of N fertiliser on the chemical and botanical composition of pasture were minor. There were no significant effects of N fertiliser on mean fat corrected milk yield, (19.9 kg/day 4.0% FCM), milk yield (16.2 kg/day), milk fat % (5.6%), milk fat yield (0.9 kg/day), or liveweight change (-0.59 kg/day). Milk protein yield (P.0.05) and protein % (P<0.05) and protein % (P0.01) were greater for LN than for HN treatment groups (0.58 vs 0.56 kg/cow/day and 3.6 vs 3.5% respectively). Voluntary DMI was also affected by N fertiliser for cows on ad lib. pasture allowance (14.0 vs. 14.6 kg DM/cow/day for HN and LN treatments; P<0.01). The application of N fertiliser in winter/early spring, had only minor effects on pasture intake or milk yield and composition in early lactation.
Proceedings of the New Zealand Society of Animal Production, Volume 55, , 42-45, 1995
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