SEX-DIFFERENCES IN INCUBATION LENGTH AND HATCHING WEIGHTS OF BROILER CHICKS

被引:56
作者
BURKE, WH
机构
[1] Department of Poultry Science, University of Georgia, Athens
关键词
SEX DIFFERENCES; INCUBATION TIME; EGG WEIGHT; BODY WEIGHT; CHICKS;
D O I
10.3382/ps.0711933
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
Two experiments were run using broiler eggs (Peterson x Arbor Acres) to determine whether sex differences exist in incubation time required to hatch males and females and in various measures of chick weight (CW). Relationships between measures of CW and incubation time and between CW and egg weight (EW) were determined. Chicks that had emerged from eggs were removed from the hatcher at approximately 6- (5 to 8) h intervals between 490.5 and 527.5 h of incubation in Experiment 1 and at about 2-h intervals between 483 and 524 h of incubation in Experiment 2. Chicks were weighed before and after removal of the residual yolk sac immediately upon removal from the hatcher. In both experiments, a preponderance of early-hatching chicks were female. The time at which 50% of the females had hatched was significantly (P = .05) earlier than the 50% hatch time for males (2.68 and 3.32 h in Experiments 1 and 2, respectively). About 71% of the females had hatched by 504 and 509 h in Experiments 1 and 2, whereas only 57 and 52% of the males had hatched at comparable times. In Experiment 2, the yolk-free CW (YFCW) of males tended to be greater than that of females (P = .07) and the YFCW expressed as a percentage of EW was significantly (P = .007) greater. The regression of CW and YFCW on EW were highly significant and positive in both experiments. There was a significant relationship between EW and time required to hatch for males in Experiment 1 only.
引用
收藏
页码:1933 / 1938
页数:6
相关论文
共 15 条
[1]   THE ROLE OF PLASMA THYROID-HORMONES IN THE REGULATION OF BODY-WEIGHT OF SINGLE COMB WHITE LEGHORN AND BROILER EMBRYOS [J].
BURKE, WH ;
ARBTAN, KD ;
SNAPIR, N .
POULTRY SCIENCE, 1990, 69 (08) :1388-1393
[2]   SEX-DIFFERENCES IN BODY-WEIGHT OF CHICKEN EMBRYOS [J].
BURKE, WH ;
SHARP, PJ .
POULTRY SCIENCE, 1989, 68 (06) :805-810
[3]   POSTHATCH INCUBATION-TIME AND EARLY GROWTH OF BROILER-CHICKENS [J].
HAGER, JE ;
BEANE, WL .
POULTRY SCIENCE, 1983, 62 (02) :247-254
[4]  
HAYS FA, 1941, MASSACHUSETTS AGR EX, V384
[5]  
HENDERSON EW, 1956, MICH EXP STN Q B, V36, P362
[6]  
JULL MA, 1925, J AGR RES, V20, P223
[7]   THE ROLE OF WATER-INTAKE ON SEXUAL DIMORPHISM FOR EARLY GROWTH OF BROILERS [J].
MARKS, HL .
POULTRY SCIENCE, 1986, 65 (03) :433-435
[8]   SEXUAL DIMORPHISM IN EARLY FEED AND WATER-INTAKE OF BROILERS [J].
MARKS, HL .
POULTRY SCIENCE, 1985, 64 (03) :425-428
[9]   SEXUAL DIMORPHISM IN BROILERS FOLLOWING PERIODS OF EQUAL WATER AND FEED-INTAKE [J].
MARKS, HL .
POULTRY SCIENCE, 1987, 66 (03) :381-389
[10]  
MUNRO S. S., 1940, SCI AGRIC [OTTAWA], V20, P586