Influence of lasalocid and supplement level on productivity of gestating ewes grazing winter range     

V M Thomas  M J McInerney  E Ayers  R Kott 《Journal of animal science》1990,68(6):1530-1535

Two winter feeding trials (1985-86; 1986-87) were conducted to evaluate the productivity of gestating ewes fed lasalocid (L) and two supplement levels while grazing Montana winter range. Five hundred range ewes were randomized within age and breed each year and allotted to .15 or .23 kg hd-1.d-1 of a 20% CP supplement and either no L or L at 70 mg hd-1.d-1. Feed treatments began on 18 Dec. approximately 100 d before the first expected lambing date and continued for 84 d. Ewes fed .23 kg of supplement per day gained more (P less than .01) total weight (4.9 vs 4.0 kg) during the 84-d experiment and had higher (P less than .05) grease fleece weights (4.2 vs 4.0 kg) than those fed .15 kg of supplement. Lasalocid had no effect (P greater than .05) on ewe weight change or grease fleece weights. Supplement level had no effect (P greater than .05) on reproduction, lamb mortality and lamb performance. Ewes fed L had a greater (P less than .05) percentage of lambs born per ewe than those not fed L (120.7 vs 112.1%); lamb performance was similar (P greater than .05) between treatments. However, because a greater percentage of lambs were born per ewe starting the experiment, ewes fed L produced more (P less than .05) kilograms of weaned lamb than those not fed L (25.9 vs 23.4 kg). In conclusion, ewes fed L and grazing winter range weaned more kg of lamb than did controls because of an improved lambing percentage.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   

Suboptimal growth associated with porcine intestinal adenomatosis in pigs in nutritional studies     

RP GOGOLEWSKI  RW COOK  ES BATTERHAM 《Australian veterinary journal》1991,68(12):406-408

  相似文献   

Sarcoptic mange in wombats   总被引：1，自引：0，他引：1  

LF SKERRATT  RW MARTIN  KA HANDASYDE 《Australian veterinary journal》1998,76(6):408-410

  相似文献   

Dentigerous cysts in a Tasmanian sheep flock     

TJ McMANUS  RW MASON 《Australian veterinary journal》1998,76(2):96-97

  相似文献   

Evaluation of cytoplasmic effects on agronomic and seed quality traits in two doubled haploid populations of Brassica napus L.     

I. Rajcan  K.J. Kasha  L.S. Kott  W.D. Beversdorf 《Euphytica》2002,123(3):401-409

Cytoplasmic effects have been occasionally implicated in the inheritance of several traits in oilseed rape (Brassica napus L.), including linolenic acid concentration (18:3) in the oil. It is important that these be considered when choosing the direction of cross for producing new breeding populations. To study this phenomenon, a reciprocal cross was made between two genotypes of oilseed rape, Reston and LL09, which differed for their erucic and linolenic acid concentrations in the seed oil. Two DH populations, which were produced by microspore culture from reciprocal F₁ plants, were evaluated in the growth room for one generation and in the field at two locations in Southern Ontario in 1993and 1994. Field notes were taken on days to flower, days to maturity,plant lodging, plant height and, seed quality traits. In the growth room study, the phenotypic distribution of 18:3 differed significantly between the two reciprocal DH populations. In the field, significant reciprocal differences between the population means were detected for 18:3,flowering date and protein content in both years and for days to maturity and oil content in 1993 only. To further study the parental lines,chloroplast (cp) and mitochondrial (mt) DNA from parental lines were isolated and subjected to RFLP and RAPD analysis. Several random primers revealed reproducible DNA polymorphism (RAPD) between the parental mt DNA. It is concluded that the direction of cross should be taken into consideration by oilseed rape breeders relying solely on doubled haploids for developing genotypes with modified seed quality traits in Brassica napus L. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

Feral pigs - the time bomb     

RW GEE 《Australian veterinary journal》2002,80(1):96-96

  相似文献   

Reply     

B HORN  RW MITTEN 《Australian veterinary journal》2001,79(2):114-114

  相似文献   

Neospora caninum infection in dogs     

BL MUNDAY  JP DUBEY  RW MASON 《Australian veterinary journal》1990,67(2):76-77

  相似文献   

Osmium Recycling in Subduction Zones     

AD Brandon  RA Creaser  SB Shirey  RW Carlson 《Science (New York, N.Y.)》1996,272(5263):861-864

Peridotite xenoliths from the Cascade arc in the United States and in the Japan arc have neodymium and osmium isotopic compositions that are consistent with addition of 5 to 15 percent of subducted material to the present-day depleted mantle. These observations suggest that osmium can be partitioned into oxidized and chlorine-rich slab-derived fluids or melts. These results place new constraints on the behavior of osmium (and possibly other platinum group elements) during subduction of oceanic crust by showing that osmium can be transported into the mantle wedge.  相似文献   

Molecular Basis of Gene-for-Gene Specificity in Bacterial Speck Disease of Tomato   总被引：6，自引：0，他引：6  

SR Scofield  CM Tobias  JP Rathjen  JH Chang  DT Lavelle  RW Michelmore  BJ Staskawicz 《Science (New York, N.Y.)》1996,274(5295):2063-2065

Transient expression of the Pseudomonas syringae avirulence gene avrPto in plant cells resulted in a Pto-dependent necrosis. The AvrPto avirulence protein was observed to interact directly with the Pto resistance protein in the yeast two-hybrid system. Mutations in the Pto and avrPto genes which reduce in vivo activity had parallel effects on association in the two-hybrid assay. These data suggest that during infection the pathogen delivers AvrPto into the plant host cell and that resistance is specified by direct interaction of Pto with AvrPto.  相似文献