Correspondence and reprint requests should be addressed to: Prof. David A. Sack Executive Director ICDDR,B: Centre for Health and Population Research GPO Box 128, Dhaka 1000 Bangladesh Email: [email protected] Fax: +(880-2) 882 3116 Recent analysis of results of the 1985 vaccine trial in Bangladesh showed that a killed oral cholera vaccine could provide herd protection (1), and this finding shed...

Widespread introduction of rotavirus vaccines has led to major reductions in the burden of rotavirus gastroenteritis worldwide. Vaccine effectiveness is diminished, however, in low income countries, that harbour the greatest burden of rotavirus attributed morbidity and mortality. Indirect effects of rotavirus vaccine (herd immunity and herd protection) could increase population level impact and...

Weaning weights from nine sets of Angus field data from three regions of the United States were analyzed. Six animal models were used to compare two approaches to account for an environmental dam-offspring covariance and to investigate the effects of sire x herd-year interaction on the genetic parameters. Model 1 included random direct and maternal genetic, maternal permanent environmental, and...

Test day (TD) milk yield and protein percentage models and genetic parameters estimation has been studied in Latxa and Manchega milk ewes. Genetic parameters for test day data were estimated under a multivariate animal model which considered production in successive test days in first lactation as different traits and under a univariate animal model considering milk and protein percentage test ...

The objectives of this study were to estimate heritabilities within herds participating in Dairy Herd Improvement and determine the relationship of the individual herd heritability with sire misidentification rate. Individual herd heritabilities for milk, fat, and protein yield and somatic cell score (SCS) were calculated with daughter-dam regression and daughter-sire predicted transmitting abi...

Estimates of covariance components and genetic parameters were obtained for birth, weaning, 200-d, and 400-d weight for a herd of Polled Herefords and a herd of a multibreed synthetics, the so-called Wokalups. Data originated from an experiment in Western Australia selecting for preweaning growth rate. Analyses were carried out by REML fitting an animal model including genetic and permanent env...

In New Zealand (NZ) herd testing is done for milk, fat, protein and somatic cell count (SCC). Currently, routine genetic evaluation is done for milk, fat and protein yields but not for SCC. A new system has been developed to calculate SCC breeding values (BVs) for the dairy industry. The current evaluation of milk, fat and protein involves combining herd test results to predict a 270-day yield ...