The use of various substrates and substrate concentrations by a Hyphomicrobium sp. isolated from soil: Effect on growth rate and growth yield

1996 ◽  
Vol 31 (1) ◽  
Author(s):  
K. Aa ◽  
R.A. Olsen
Keyword(s):  
Growth Rate ◽  
Growth Yield ◽  
Substrate Concentrations ◽  
Effect On Growth

The influence of high phenol concentration on microbial growth

1997 ◽  
Vol 36 (2-3) ◽  
pp. 75-79
Author(s):  
E. T. Yoong ◽  
P. A. Lant ◽  
P. F. Greenfield
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Microbial Growth ◽  
Specific Growth ◽  
Growth Yield ◽  
Yield Coefficient ◽  
Inhibition Kinetics ◽  
Batch Cultures ◽  
Substrate Concentrations ◽  
High Phenol Concentration

This investigation looked at the influence of high phenol concentrations (1000-1500 mg/l) on the growth yield of phenol degrading organisms in batch culture. The yield coefficient varied from 0.16 to 0.27. These values are considerably lower than those determined by others at lower phenol substrate concentrations. Although the conversion efficiency to biomass was low, the removal of phenol in terms of COD in the batch cultures was high (93.6% average). Present results did not show a relationship between yield and specific growth rate over the range 1000-1500 mg/l phenol. More work is required over a wider range of substrate concentration. With increasing phenol concentrations, the specific growth rate declined, consistent with Haldane inhibition kinetics.

THE EFFECTS OF SEX AND AGE OF MALE AT CASTRATION ON GROWTH AND CARCASS QUALITY OF YORKSHIRE SWINE

1961 ◽  
Vol 41 (1) ◽  
pp. 30-39 ◽  
Author(s):  
L. A. Charette
Keyword(s):  
Growth Rate ◽  
Iodine Number ◽  
Feed Efficiency ◽  
Carcass Characteristics ◽  
Live Weight ◽  
Carcass Quality ◽  
Selection Of ◽  
Effect On Growth

The effects of sex and age of castration of males on growth rate, feed efficiency and carcass characteristics in bacon type swine were measured using 16 pigs each as gilts, entire boars, and boars castrated at birth, 6, 12, 16, and 20 weeks of age. Castration at 20 weeks was too late since some pigs reached 200 pounds live weight before that age. Boars consumed less feed daily than barrows and gilts, were thinner in loin fat, and yielded a higher percentage of shoulder than gilts. The carcasses of boars and gilts were longer, had less fat covering over the shoulder and back, a larger area of loin, and a higher iodine number than those castrated late. Acceptability tests showed that sex or age of castration did not affect the flavour, odour, or tenderness of the meat.Purebred breeders can delay castration for better selection of boars without any serious effect on growth, physical carcass characteristics, and feed requirements. Although the market discriminates against boars, it appears questionable whether castration is necessary when boars are slaughtered at 200 pounds before they reach the age of 150 days.

scholarly journals Substitution of soyabean meal with bioactive yeast in the diet of Clarias gariepinus: Effect on growth rate, haematological and biochemical profile

2012 ◽  
Vol 11 (91) ◽  
pp. 15802-15810 ◽  
Author(s):  
Evelyn Ezenwaji Ngozi ◽  
Iluno Ada ◽  
Atama Chinedu ◽  
Onyekachi Nwaigwe Chukwuemeka ◽  
Uchenna Nwaigwe Chioma
Keyword(s):  
Growth Rate ◽  
Clarias Gariepinus ◽  
Biochemical Profile ◽  
Soyabean Meal ◽  
Effect On Growth

scholarly journals WATER QUALITY AND ITS EFFECT ON GROWTH AND SURVIVAL RATE OF LOBSTER REARED IN FLOATING NET CAGE IN EKAS BAY, WEST NUSA TENGGARA PROVINCE

2015 ◽  
Vol 6 (2) ◽  
Author(s):  
Muhammad Junaidi ◽  
Mat Sardi Hamzah
Keyword(s):  
Water Quality ◽  
Growth Rate ◽  
Survival Rate ◽  
Quality Data ◽  
Dominant Factor ◽  
Growth And Survival ◽  
Water Quality Status ◽  
Net Cage ◽  
Quality Status ◽  
Effect On Growth

ABSTRACT The development of lobster farming in floating net cage in Ekas Bay caused an environmental degradation such as decrease water quality due to some aquaculture wastes. The purposes of this study were to determine the status of water quality and their effect on growth and survival rate of lobster reared in floating net cages (FNC) in the Ekas Bay, West Nusa Tenggara Province. Water sample collection and handling referred to the APHA (1992). Analyses of water quality data were conducted using Principal Component Analysis. Determination of the water quality status of Ekas Bay was performed with STORET system. Multivariate analyses were used to determine the relationship between water quality, growth, and survival rate of lobster reared in FNC. Results showed that Ekas Bay water quality status was categorized in class C (medium contaminated), which exceeded some quality standard parameters such as ammonia (0.3 mg/l), nitrate (0.008 mg/l), and phosphate (0.015 mg/l). During lobster farming activities feeding with trash fish for 270 days, we obtained daily growth rate of  0.74% (lower than normal growth rate of 0.86%), survival rate of 66% (lower than normal survival rate of 86.7%), and feed conversion ratio of 11.15. Ammonia was found as a dominant factor reducing growth  and survival rate of lobster reared in FNC. Keywords: water quality, lobsters, growth, survival, Ekas Bay

Lack of an association between heterozygosity and growth rate in the wood frog, Rana sylvatica

1995 ◽  
Vol 73 (3) ◽  
pp. 569-575 ◽  
Author(s):  
Michael F. Wright ◽  
Sheldon I. Guttman
Keyword(s):  
Growth Rate ◽  
Multiple Regression ◽  
Rana Sylvatica ◽  
Developmental Period ◽  
Wood Frog ◽  
Single Locus ◽  
Regression Analyses ◽  
Enzyme Loci ◽  
Effect On Growth

The effect of both multilocus and single-locus heterozygosity on growth rate was examined in a cohort of larvae of the wood frog, Rana sylvatica, collected from a pond during the later stages of premetamorphic development. Seven electrophoretically detected enzyme loci were used to determine individual heterozygosity, whereas the growth rate was measured as wet mass. In all cases, no significant correlation was found between multilocus heterozygosity and mass among larvae collected at intervals during the developmental period. In addition, multiple regression analyses indicated that no single locus had a demonstrable effect on growth rate. The results of this study, therefore, provide no evidence for a link between enzyme heterozygosity and growth rate during the later stages of premetamorphic development in wood frog larvae.

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