Some Studies of Lactation Records

Genotype and Variability in Dairy Lactation Records.

Comparison of methods to extend part lactation records

The Norwegian cow index of 1978 is described. The formula is standard and is based on information from a) lactation yield per year, b) corresponding herd averages, c) indexes of sire and maternal grandsire, and d. average of indexes of sires included in the herd averages. Analysis of data from 242 501 cows is also presented. Following conclusion may be drawn :-The cow index used seems to work w...

Covariances among first-lactation milk records of cousins.

Covariances among first-lactation milk records expressed as deviations from herdmate averages of Holstein cows related as cousins of varying degree, as daughterdan1, as full and maternal sibs, and as aunt-niece of varying degree were examined to dete~nine whether genetic maternal effects are important. The multiple regression of the expected coefficients of additive direct, additive maternal, d...

Some Influences of Lactation and Hormone

U T E R I N E changes in the ewe during the early postpartum period have received very little attention compared to studies on other aspects of anestrus. The increasing emphasis on improving reproductive efficiency has help focus attention on the role of the uterus. W. C. Foote and M. A. Madsen (unpublished data) studied estrus, ovulation and conception in early postpartum spring lambing ewes f...

NEW RECORDS OF SOME ENTOMOPATHOGENIC FUNGI FROM IRAN

Examining dead insects from different locations in Mazandaran, Gilan and TehranProvinces, specimens with fungal outgrowth were selected for further investigations. After isolation and purification of fungi they were identified as follows:Beauveria brongniartii (Sacc.) Petch*On Coccinella septempunctata, Tehran Prov., Varamin, Ghara-Aghaj mountains, M.H. Ghassemi (IRAN 1025 C). Paecilomyces tenu...