title: Hematocrit values and mortality from ascites in cold-stressed broilers from parents selected by hematocrit.
abstract: A hypothesis that the relative hematocrit value of broilers is inherited and can serve as an indicator of partial resistance to the ascites syndrome in cold-stressed broilers was shown to be valid in a field trial. Hematocrits were determined for male and female grandparent breeding stocks. Matings were then made between low (LL), low-medium (LM), medium-high (MH), and high (HH) hematocrit parents: LL x LL, LM x LM, MH x MH, and HH x HH. The progeny of HH parents had higher hematocrit values than the progeny of lower hematocrit parents (P < 0.0001). Exposure of the progeny from all the parental groups to an ascites-predisposing cold environment caused higher losses from ascites in the progeny of the HH parents (P < 0.0001). The progeny of LH parents had an increased mortality from causes other than ascites (P < 0.0001). This work suggests that elimination of birds with HH in broiler breeding programs may be desirable where cold-induced ascites is an important problem.
authors.affiliation: Kimron Veterinary Institute, Bet Dagan, Israel.
authors.forename: A
authors.initials: A
authors.lastname: Shlosberg
authors.forename: M
authors.initials: M
authors.lastname: Bellaiche
authors.forename: G
authors.initials: G
authors.lastname: Zeitlin
authors.forename: M
authors.initials: M
authors.lastname: Yaácobi
authors.forename: A
authors.initials: A
authors.lastname: Cahaner
mesh_terms: D000367:Age Factors; D000818:Animals; D001201:Ascites / Q000097:blood / Q000209:etiology / Q000401:mortality / Q000662:veterinary*; D002645:Chickens / Q000097:blood / Q000235:genetics*; D003080:Cold Temperature / Q000009:adverse effects*; D005260:Female; D006400:Hematocrit / Q000662:veterinary; D008297:Male; D011201:Poultry Diseases / Q000097:blood* / Q000209:etiology / Q000401:mortality*; D012641:Selection, Genetic; D013312:Stress, Physiological / Q000097:blood / Q000401:mortality / Q000662:veterinary