الفهرس 
Effect of lactation lengthOnly 14 pages are availabe for public view
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Abstract
.An fm=est;igation a carrled out to study reco two Fsleafan dairy farm belsngbng $0 Animal Produetion Research Ins-kBtute, Minfetry ~f A rlculture, SPtusted in fr El-Sheikh Province, aor%h of %he Delta. The total number of records were 2531 yearly milk yield given by 951 co These sessmls were csllec%ed over ea, period of 13 yeam (1967 to 1979). The effect sf some noas-genetical factors such aax fam, year 0% calving, parity, season of c?alving,lastatisn Be@h, calving internal, preceding dry period and aemfce period on total milk yield, 3QS-days milk yield and Initial milk yield (70-days yield The relation between I.M.Y, and both T,1BII,ab, am3 305- days milk yield were es%fma$ed. Also %he effect of yeas of calving, parPty and. seasoa of calvf~go n lactation length, calving internal, dry period a sem2ce period, were studied .