Results 301 to 310 of about 1,102,149 (353)
Some of the next articles are maybe not open access.
ESTIMATING SEA OTTER REPRODUCTIVE RATES
Marine Mammal Science, 1994Abstract: Sea otters may give birth in any month of the year, so obtaining reproductive rates by observation is difficult. Reproductive rates may be estimated directly (births per otter‐year observed) or by determining the time interval between births.
L. L. Eberhardt, K. B. Schneider
openaire +1 more source
The reproductive rates of Australian rodents
Oecologia, 1985The reproductive rates of about 50 species of Australian rodents were studied by calculating allometric equations for the relationships between female body weight, litter size, length of gestation and weaning periods as well as age of sexual maturity.Members of the subfamily Hydromyinae, which invaded Australia 5-10 million years ago, are characterised
openaire +2 more sources
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
openaire +2 more sources
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
openaire +2 more sources
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.
openaire +1 more source
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 ...
openaire +1 more source
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
openaire +1 more source
Twinning rate and reproduction failures.
Progress in clinical and biological research, 1979Spontaneous abortion of one of the zygotes is shown to explain some of the main epidemiologic features of dizygotic twinning: its decrease at higher maternal ages and its spatial and secular variations. Conversely, the dizygotic twinning rate offers a precious tool for the study of the etiology of reproduction failures.
P, Lazar, D, Hemon, C, Berger
openaire +1 more source
Microorganisms in the reproductive tissues of arthropods
Nature Reviews Microbiology, 2020Jessamyn I Perlmutter +1 more
exaly