Minas, bent u er al klaar voor?

Het mineralenaangiftesysteem, MINAS, komt eraan. Gelukkig wisten we dat al een tijdje. Daarom heeft het PR de laatste jaren al veel onderzoek gedaan naar zowel het mineralenverbruik als de mineralenoverschotten op melkveebedrijven. Helaas zijn op dit moment nog niet alle vragen beantwoord. Met name over het verloop van de bodemvruchtbaarheid bij suboptimale bemestingen weten we nog niet genoeg. Meerjarig onderzoek moet hierop een antwoord geven. Bij een ongewijzigde bedrijfsvoering betekent MINAS voor veel bedrijven een forse financiële aderlating. Vooral bedrijven met hoge veebezettingen en/of hoge mineralenoverschotten kunnen echter door aanpassing van de bedrijfsvoering veel geld besparen. Het PR kan hierbij helpen

Donateurschap PR, vanaf 2000 met kennisdatabank internet

De kennisdatabank bestaat uit twee delen, een databank met de PR-informatie en de elektronische vraagbaak veehouderij

Effect of Conventional or High Protein Dry Distillers Grains Plus Solubles in Either Dry- Rolled or Steam- Flaked Corn Based Diets on Finishing Performance of Steers

A 2 × 3 factorial finishing study evaluated feeding 0 or 30% high protein distillers grains or conventionally produced distillers in either steam- flaked or dry- rolled corn based diets. Feeding conventional distillers grains in dry rolled corn based diets resulted in improved feed conversion, with no difference between high protein distillers grains as compared to conventional DDGS when included in dryrolled corn diets. In steam flaked corn- based diets, feeding high protein distillers and conventional distillers tended to increase feed conversion. Feeding conventional distillers or high protein distillers grains resulted in greater DMI and ADG as compared to diets with no distillers inclusion in both dry- rolled and steam- flaked diets. Cattle consuming SFC had lower DMI than DRC, which lead to improved feed conversions as expected. Th e response to feeding DDGS is different whether replacing dry- rolled corn or steamflaked corn, but high protein distillers was fairly similar to conventional DDGS

Effects of Varying Levels of Silage Inclusion and Brown Midrib Corn Silage on Finishing Performance of Steers

A 2 × 3 factorial finishing study evaluated traditional or brown midrib corn silage fed at three inclusions in finishing diets. Silage inclusion was 15%, 45%, or 75% inclusion (DM basis) for 70 days followed by 15% inclusion for the remainder of the finishing phase. Cattle were ultrasounded twice to calculate backfat deposition rate for a target backfat of 0.55 inches, as cattle were fed longer if silage inclusion was 45 or 75/15%. Cattle fed 45% or 75/15% silage inclusion had greater final body weight (BW) and days on feed, but higher feed:gain (F:G) than cattle fed 15% silage. Daily gain was greatest for cattle fed 15% silage, but not different between cattle fed 45% and 75/15% treatments. Cattle fed 45% and 75/15% silage had greater final hot carcass weight (HCW) and longissimus muscle (LM) area than 15% but fed for 28 additional days. Dry matter intake was greater for cattle fed brown midrib (bm3) silage but gain or F:G were not affected. Backgrounding cattle on a low energy diet followed by a high energy diet resulted in similar growth performance and carcass endpoint as cattle fed a consistent inclusion of silage throughout the entirety of the feeding period. Feeding cattle 45% or 75/15% silage resulted in larger carcass weights and more days on feed (DOF) than cattle fed 15% silage for the finishing period. This resulted in greater returns for cattle fed 45% and 75/15% silage diet as compared to cattle fed a high energy 15% silage diet throughout the feeding period

Effect of Conventional or High Protein Dry Distillers Grains Plus Solubles in Either Dry- Rolled or Steam- Flaked Corn Based Diets on Amount and Site of Nutrient Digestion

A 2 × 3 factorial metabolism study using 6 ruminally and duodenally cannulated heifers evaluated the site and amount of nutrient digestion when feeding high protein dry distillers grains plus solubles (DDGS) or conventionally produced DDGS at 30% inclusion compared to feeding no distillers in either dry- rolled or steam- flaked corn diets. Apparent total tract starch digestibility was unaffected by distillers treatment in SFCbased diets, but decreased from 95.1% to 92.0% when DDGS was added to DRC diets, and further decreased to 88.7% for HiPro diets. Dry matter and OM digestibilities were lower types of when either DDGS diets were fed, but no differences were observed between conventional or high protein DDGS. Feeding high protein DDGS did not change digestion compared to conventional DDGS, despite higher CP content. Digestion is greater when cattle are fed steam- flaked corn compared to dry- rolled corn