Opname van gras- en mengkuil door dragende biologische zeugen

In dit onderzoek is nagegaan of bij dragende zeugen een deel van het krachtvoer door graskuil of mengkuil met CCM of gerst kan worden vervangen. Biologisch gehouden dragende zeugen krijgen in de winterperiode veelal graskuil. Omdat de opname hiervan niet goed bekend is, is het moeilijk de hiernaast gewenste krachtvoergift vast te stellen. In deze proef is de opname van twee soorten graskuil bij dragende zeugen vastgesteld. Daarnaast is de opname bepaald van graskuil die gemengd was ingekuild met gerst of CCM (mengkuilen), omdat hiermee naar verwachting een groter aandeel krachtvoer vervangen kan worden. Tevens is het effect van de rantsoensamenstelling en de opname hiervan op de conditie van de zeugen en de biggenproductie bestudeerd

Opname van gras- en mengkuil door dragende biologische zeugen

In this study it was determined whether the concentrate allowance of pregnant sows can be partly replaced by the supply of grass silage of grass silage mixed with barley or CCM

SILAGE IN DIETS FOR ORGANIC SOWS IN GESTATION

This study was conducted to determine whether the supply of grass silage or grass silage mixed with barley or CCM to organically raised gestating sows would allow a reduction of compound feed allowance without loss in animal performance. On average, sows fed grass silage or mixed silage were able to compensate for a pre-set reduction of 1 kg or 1.5 kg compound feed, respectively. However, the variation in silage intake between individual sows was large, with a number of mainly young sows consuming less silage than the required amount. Consequently, these sows showed a net back fat loss during the experimental period from d 7 of gestation to weaning. Our results indicate that more feeder space than 1 for 8 sows is required to allow adequate silage intake in group housed sows. From this study we cannot derive whether that would be also allow young sows to realise an adequate silage intake. In conclusion, it seems possible to replace 1 kg compound feed by free access to grass silage and 1.5 kg compound by mixed barley or CCM silage, provided that variation between sows is reduced and young sows would also be able to ingest an adequate amount of silage

Feynman Path Integral on the Noncommutative Plane

We formulate Feynman path integral on a non commutative plane using coherent states. The propagator for a free particle exhibits UV cut-off induced by the parameter of non commutativity.Comment: 7pages, latex 2e, no figures. Accepted for publication on J.Phys.

Het project 'Monitoring Diergezondheid', beschrijving en analyse van doorlopen processen

Het doel van het project is om tot een gemeenschappelijk ontwerp voor een informatieverzamelings- en analysesysteem te komen ten behoeve van de monitoring van diergezondheid én voedselveiligheid, dat kan rekenen op een breed draagvlak bij publieke en private partijen; draagvlak dat noodzakelijk is voor de realisering van zo’n dataverzame-lingssysteem (uit projectplan, 23 januari 2004). Dit ontwerp is echter nooit in de praktijk gerealiseerd. Een beschrijving en analyse van het proces van de laatste jaren in het project ‘Monitoring Diergezondheid’, is in dit document vastgelegd. Tevens zijn ervaringen die in dit project zijn opgedaan door het projectteam, inzichtelijk en bruikbaar gemaakt voor andere

Garlic reduces effect of Actinobacillus pleuropneumoniae infection in pigs

Lung diseases in pigs are among the most important health problem in pig husbandry, and generally treated with antimicrobials. To reduce the amount of antimicrobials used in pigs, we tested the preventive effects of freeze dried garlic added to feed on an infection with Actinobacilluspleuropneumoniae (APP). Thirty male pigs of about seven weeks of age were aerosol challenged with APP serotype 2. Fifteen pigs received 5% (w/w) garlic added to their diet (Garlic group), from two days prior to infection until four days after infection. The others received the a standard diet (Control group)

Amino acid requirement of growing and finishing pigs

In the Netherlands, AA recommendations for pigs are published by the Centraal Veevoederbureau (CVB, Central Bureau for Livestock Feeding). The CVB recommendations, however, have not been updated since 1996. Because the genetic capacity and therefore daily gain and feed conversion ratioof the growing and finishing pigs have been improved in the last 20 years and will probably further improve in the next years, the amino acid recommendations from 1996 had to be updated. The updated AA requirements in starter, grower and finisher diets for the current and future growing and finishing pigs (boars, gilts and barrows) are presented in this report

Function of the fully conserved residues Asp99, Tyr52 and Tyr73 in phospholipase A2

In the active centre of pancreatic phospholipase A2 His48 is at hydrogen-bonding distance to Asp99. This Asp-His couple is assumed to act together with a water molecule as a catalytic triad. Asp99 is also linked via an extended hydrogen bonding system to the side chains of Tyr52 and Tyr73. To probe the function of the fully conserved Asp99, Tyr52 and Tyr73 residues in phospholipase A2, the Asp99 residue was replaced by Asn, and each of the two tyrosines was separately replaced by either a Phe or a Gln. The catalytic and binding properties of the Phe52 and Phe73 mutants did not change significantly relative to the wild-type enzyme. This rules out the possibility that either one of the two Tyr residues in the wild-type enzyme can function as an acyl acceptor or proton donor in catalysis. The Gln73 mutant could not be obtained in any significant amounts probably due to incorrect folding. The Gln52 mutant was isolated in low yield. This mutant showed a large decrease in catalytic activity while its substrate binding was nearly unchanged. The results suggest a structural role rather than a catalytic function of Tyr52 and Tyr73. Substitution of asparagine for aspartate hardly affects the binding constants for both monomeric and micellar substrate analogues. Kinetic characterization revealed that the Asn99 mutant has retained no less than 65% of its enzymatic activity on the monomeric substrate rac 1,2-dihexanoyldithio-propyl-3-phosphocholine, probably due to the fact that during hydrolysis of monomeric substrate by phospholipase A2 proton transfer is not the rate-limiting step. The Asp to Asn substitution decreases the catalytic rate on micellar 1,2-dioctanoyl-sn-glycero-3-phosphocholine 25-fold. To explain this remaining activity we suggest that in the mutant the Asn99 orients His48 in the same way as Asp99 orients His48 in native phospholipase A2 and that the lowered activity is caused by a reduced stabilization of the transition state