Results 211 to 220 of about 537,641 (265)
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Reproductive Span and Rate of Reproduction Among Hutterite Women
Fertility and Sterility, 1957As studies of procreative capacity in the human female are seriously limited by the fact that it is difficult to find sizable populations for which accurate data can be obtained and which do not practice contraception it is fortunate that a substantial body of new data has become available concerning a contemporary American community--the Hutterites ...
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Selection for reproductive rate in Rambouillet sheep: Estimated genetic change in reproductive rate
Small Ruminant Research, 1993Abstract Rambouillet sheep were selected for high or low reproductive rate based on an index of reproductive rate, reproductive index = dam's total lifetime lambs born/(age in years-1). Selected ewes were first born in 1969. A random bred control line was established from the remaining foundation ewes with the first ewes born in 1973.
P.J. Burfening +3 more
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Tropical Animal Health and Production, 1986
Age specific replacement rate, net reproduction rate and intrinsic rate of population increase were estimated from records over a period of 11 years of Merino, Nilagiri and halfbreds. On an average for every 1000 ewes mated 830 ewes lambed, 917 lambs were born, 898 lambs were weaned and 422 ewe lambs survived to joining age (one and a half years) in ...
M, Mohan +4 more
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Age specific replacement rate, net reproduction rate and intrinsic rate of population increase were estimated from records over a period of 11 years of Merino, Nilagiri and halfbreds. On an average for every 1000 ewes mated 830 ewes lambed, 917 lambs were born, 898 lambs were weaned and 422 ewe lambs survived to joining age (one and a half years) in ...
M, Mohan +4 more
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Reproduction of Hysteresis in Rating Curves
Journal of Hydraulic Engineering, 2004The well-known Jones formula has long been used to convert a stage hydrograph to a discharge hydrograph under many unsteady flow situations. The logic behind the formula can be explained with the use of the approximate convection–diffusion equation in its development. However, its applicability criterion has not yet been quantified.
Muthiah Perumal +2 more
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Reproductive Span and Rate of Reproduction Among Hutterite Women
1987Studies of procreative capacity in the human female are seriously hampered by the fact that it is quite difficult to find sizable populations for which accurate records can be obtained and which do not practice contraception. It is, of course, always feasible to collect histories from individual couples who have made no attempt to control their ...
Sara L. Tietze, Richard Lincoln
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Reproductive Intentions and Fertility Rates
International Family Planning Perspectives, 1990An evaluation of whether the stated desire to terminate childbearing is a valid predictor of fertility using national data from 134 surveys conducted over the past 10-15 years reveals a strong relationship between the total fertility rate and the percentage of women who want no more children even when the comparison is restricted to developeing ...
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Predicting reproduction rate of varroa
Ecological Modelling, 2012Abstract A single equation is derived to predict population–density effects on the reproduction rate of the honey bee parasite Varroa destructor Anderson and Trueman. This equation provides a simpler alternative to the approach currently used in the literature, and additionally corrects an anomaly in that approach.
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The Reproductive Rates of Australian Passerines
Wildlife Research, 1987The relationships between body weight, clutch size, length of breeding season, breeding frequency, incubation and nestling periods were studied in the Australian passerines. The means of the above factors as well as allometric equations were calculated for all Australian passerines and separately for the four major families (Maluridae, Meliphagidae ...
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Variations in the reproductive rate of birds
Proceedings of the Royal Society of London. Series B - Biological Sciences, 1956Abstract At the present time, some geneticists are using the term ‘population dynamics’ for differences in the survival rates of different genotypes in the wild (population genetics), while some ecologists are using it for the balance between birth-rates and death-rates in a whole population (population ecology).
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