The goals of these trials were to investigate the effects of different dietary amino acid concentrations and valine:lysine ratios on piglet performance and health. Two 4-week trials with 90 weaned piglets each were conducted. Both trials were set up as a block design with 3 treatments and 6 replicates per treatment (a total of 18 pens with 5 piglets each). The following treatments were tested: Trial 1: (i) 14.0 MJ DE, 180 g CP, 12.5 g lysine, 8.6 g valine; (ii) 14.0 MJ DE, 165 g CP, 11.5 g lysine, 7.9 g valine; (iii) 14.0 MJ DE, 165 g CP, 11.5 g lysine, 8.5 g valine. Trial 2: (i) 14.0 MJ DE, 180 CP, 12.4 g lysine, 8.6 g valine; (ii) 14.0 MJ DE, 165 g CP, 12.4 g lysine, 7.9 g valine; (iii) 14.0 MJ DE, 165 g CP, 12.4 g lysine, 8.6 g valine. In trial 1, the higher crude protein and amino acid concentrations led to a significant improvement in FCR (1.43a, vs 1.53b and 1.51b kg/kg; P<0.05). Increasing the amino acid concentrations in the treatment with reduced CP concentration allowed maintain performance to be maintained at the level of the standard diet in trial 2. The supplementation of the essential amino acid valine did not affect performance or animal health in either trial.
Pontiggia A., Münger A., Ammer S., Philipona C., Bruckmaier R. M., Keil N.M., Dohme-Meier F.
Even in temperate climate zones, an increase in the ambient temperature and solar radiation can cause heat stress in grazing dairy cows. Agroscope studied the physiological changes in cows caused by increasing heat load.
Lazzari G., Münger A., Heimo D., Seifert S., Camarinha-Silva A., Borda-Molina D., Zähner M., Schrade S., Kreuzer M., Dohme-Meier F.
In dairy cows, herbage-based diets often lead to increased nitrogen excretion. Tanniferous sainfoin and extract of acacia can reduce nitrogen excretion from urine and thus ammonia volatilization from slurry.
Excessive nitrogen inputs from the air lead to over-fertilisation of sensitive ecosystems. Continuous feeding optimisation can make an important contribution to reducing ammonia losses and thus nitrogen inputs.