A leader by consensus     

Aldhous P 《Science (New York, N.Y.)》1993,262(5141):1809

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Segregation and linkage analysis of DNA markers in microspore derived and F2 populations of oilseed rape (Brassica napus L.)     

P. K. Tanhuanpää  J. P. Vilkki  H. J. Vilkki 《Euphytica》1993,74(1-2):59-65

Summary The segregation of RFLP and RAPD markers was compared in two oilseed rape (Brassica napus L.) breeding populations from the cross Topas x R4, the latter being a low linolenic mutation line. A total progeny of 68 F₂ and 40 microspore derived plants were studied with 25 markers. The results indicated a significant excess of Topas alleles at five RAPD loci in the microspore derived population. This suggests that genomic regions which probably affect microspore culture ability do not have identical distribution in the two population types.  相似文献   

Other books of interest     

Gresshoff PM 《Science (New York, N.Y.)》1993,262(5142):2071-2072

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Unpopularized genius     

Ceruzi PE 《Science (New York, N.Y.)》1993,260(5111):1164-1165

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Power from wind turbines     

Abelson PH 《Science (New York, N.Y.)》1993,261(5126):1255

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Genotypic differences in speed and magnitude of response to ahemeral lighting     

M. M. Shanawany  P. S⊘rensen  F. Pirchner 《British poultry science》1993,34(5):881-886

1. The paper compares between three genetically different lines in their egg weight and shell thickness response to a 28‐h cycle.

2. The response in shell thickness to ahemeral lighting was more rapid (2.2 d) than for egg weight (4.2 d).

3. Differences between genotypes were evident in both the speed and magnitude of response.

4. Overall, egg weight and shell thickness on the 28‐h cycle were 7% and 8% greater than on 24 h.

5. The allometric increase indicates that the increase in shell weight was on average 14% more than the increase in egg weight.  相似文献   

Measurement of endogenous amino acid losses in poultry     

P. Siriwan  W. L. Bryden  Y. Mollah  E. F. Annison 《British poultry science》1993,34(5):939-949

1. Ileal endogenous amino acid losses were determined in broiler chickens and in cannulated cross‐bred layer strain cockerels using either a nitrogen‐free diet, regression analysis or a 48 h fast.

2. Endogenous amino acid flows to the ileum in fasted cockerels were significantly lower than those obtained both by feeding the nitrogen‐free diet, and from regression analysis in either broilers or cockerels. Regression analysis gave the highest flows.

3. The apparent digestibility coefficients of amino acids in a diet containing 200 g/kg crude protein were lower in broilers (0.84) than in cockerels (0.88). When corrected, by regression analysis, for the contribution of endogenous amino acids, the true digestibility coefficients became 0.90 and 0.92 respectively.  相似文献   

Monitoring pregnancy losses in small dairy herds     

Lemire GE  Stalheim PS  Lemire MR  Tiemann M  Verdon L 《The Canadian veterinary journal. La revue veterinaire canadienne》1993,34(1):33-35

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Food intake adjustments of chicks: Short term reactions of genetic stocks to deficiencies in lysine,methionine or tryptophan     

D. O. Noble  M. L. Picard  E. A. Dunnington  G. Uzu  A. S. Larsen  P. B. Siegel 《British poultry science》1993,34(4):725-735

1. Growth, food intake, and food preference were measured in two experimental lines (White Rocks and White Leghorns) of chickens fed diets varying in content of lysine, methionine, or tryptophan. Diet A was balanced in all amino acids, while the remaining 6 diets were moderately ( ～ 30%) or slightly ( ～ 15%) deficient in either lysine, methionine, or tryptophan relative to NRC recommendations for broiler diets.

2. Body weight and food utilisation efficiency of White Leghorns at 10 d of age were not affected by diet, whereas the lower concentrations of lysine and methionine depressed these traits in White Rocks.

3. Tryptophan deficiency reduced food intake of White Leghorns, but not White Rocks.

4. With choice feeding of balanced and deficient diets from day 10 to 16, preferences between the diets were minimal for White Leghorns, whereas for White Rocks there was an almost immediate preference for the balanced diet, followed by lack of preference or preference for the deficient diet.

5. Apparently for some genetic stocks there is rapid adjustment to deficiencies in these amino acids with overconsumption, followed by compensation for preference of the balanced diet. The response, however, will vary depending on the deficient amino acid.  相似文献   

Chairman of the house science committee     

Abelson PH 《Science (New York, N.Y.)》1995,267(5195):155

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