PMID- 7877934
OWN - NLM
STAT- MEDLINE
DCOM- 19950403
LR  - 20200313
IS  - 0032-5791 (Print)
IS  - 0032-5791 (Linking)
VI  - 73
IP  - 12
DP  - 1994 Dec
TI  - Growth, livability, and feed conversion of 1957 vs 1991 broilers when fed 
      "typical" 1957 and 1991 broiler diets.
PG  - 1785-94
AB  - The relative contributions of genetic selection and dietary regimen on the 
      performance of broilers was assessed. Body weight, feed consumption, mortality 
      (M), and the degree of tibial dyschondroplasia (TD) were measured in the 1957 
      Athens-Canadian Randombred Control (ACRBC) strain of broilers and in the 1991 
      Arbor Acres (AA) feather-sexable strain when fed "typical" 1957 and 1991 diets. 
      Energy and protein levels, vitamin and mineral packs, and the coccidiostats used 
      in the two dietary regimens were chosen to be representative of those in use by 
      the industry for the two time periods. Eight treatment groups, i.e., two strains, 
      two sexes, and two dietary regimens, were assigned into four blocks of eight 
      litter floor pens for grow out. The 1957 diets were fed as mash, and the 1991 
      starter and grower diets were fed as crumbles and pellets, respectively. Feed 
      consumption and BW were recorded at 21, 42, 56, 70, and 84 d of age, a period 
      covering the normal marketing ages for the two broilers. Mortality and the cause 
      of death was recorded daily. The incidence and severity of TD was assessed using 
      a Lixiscope at 42 d of age. Average BW were 190, 508, 790, 1,087, and 1,400 g for 
      the ACRBC on the 1957 diets vs 700, 2,132, 3,108, 3,812, and 4,498 g for the AA 
      on the 1991 diets at 21, 42, 56, 70, and 84 d of age, respectively. The 1991 
      diets increased the BW of the AA by an average of 14% (20% at 42 d, but only 8% 
      at 84 d) and of the ACRBC by 22%. The BW advantage for the 1991 diet over the 
      1957 diet for the AA was less for males than for females after 42 d of age, and 
      the advantage decreased with age, probably due to the increasing incidence of leg 
      problems. The M for AA was 9.1% vs 3.3% for the ACRBC at 42 d. Most of the ACRBC 
      M occurred before 21 d, whereas M occurred throughout for the AA, with most after 
      21 d due to flip-overs and ascites. The feed conversion at 42 d for the ACRBC on 
      the 1957 diet was 3.00 vs 2.04 for the AA on the 1991 diet. The AA on the 1991 
      diet had a 48.6% incidence of TD vs 25.6% on the 1957 diet. The ACRBC had 
      approximately 1.2% TD on both diets. The TD was more severe with the 1991 diet.
FAU - Havenstein, G B
AU  - Havenstein GB
AD  - Department of Poultry Science, North Carolina State University, Raleigh 
      27695-7608.
FAU - Ferket, P R
AU  - Ferket PR
FAU - Scheideler, S E
AU  - Scheideler SE
FAU - Larson, B T
AU  - Larson BT
LA  - eng
PT  - Comparative Study
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PT  - Research Support, U.S. Gov't, Non-P.H.S.
PL  - England
TA  - Poult Sci
JT  - Poultry science
JID - 0401150
SB  - IM
MH  - *Animal Feed
MH  - *Animal Nutritional Physiological Phenomena
MH  - Animals
MH  - Breeding
MH  - Chickens/*genetics/*growth & development
MH  - Female
MH  - Male
MH  - Mortality/trends
MH  - Osteochondrodysplasias/epidemiology/veterinary
MH  - Poultry Diseases/epidemiology
MH  - Selection, Genetic
EDAT- 1994/12/01 00:00
MHDA- 1994/12/01 00:01
CRDT- 1994/12/01 00:00
PHST- 1994/12/01 00:00 [pubmed]
PHST- 1994/12/01 00:01 [medline]
PHST- 1994/12/01 00:00 [entrez]
AID - S0032-5791(19)52124-1 [pii]
AID - 10.3382/ps.0731785 [doi]
PST - ppublish
SO  - Poult Sci. 1994 Dec;73(12):1785-94. doi: 10.3382/ps.0731785.