Associations of Increased Late Embryo Loss with incidences of Anomalies and Head Disorientation toward the Small End in Broiler Hatching Eggs

For heifers, beef and moderate-yielding dairy cows, fertilisation generally exceeds 90%. In high-producing dairy cows, it may be lower and possibly more variable. The major component of embryo loss occurs before Day 16 following breeding, with emerging evidence of greater losses before Day 8 in high-producing dairy cows. Late embryo loss causes serious economic losses because it is often recognised too late to rebreed females. Systemic concentrations of progesterone during the cycles both preceding and following insemination affect embryo survival; too-high or too-low a concentration has been shown to be negatively associated with survival rate. Energy balance and dry matter intake during the 4 weeks after calving are critically important in determining conception rate when cows are inseminated 70 to 100 days after calving. More balanced breeding strategies with greater emphasis on fertility, feed intake and energy must be developed. Genetic variability for fertility traits can be exploited; genomic technology will not only provide scientists with an improved understanding of the underlying biological processes involved in fertilisation and the establishment of pregnancy, but could identify genes responsible for improved embryo survival. Their incorporation into breeding objectives would increase the rate of genetic progress for embryo survival. There is a range of easily adoptable management factors, under producer control, that can either directly increase embryo survival or ameliorate the consequences of low embryo survival rates. The correction of minor deficits in several areas can have a substantial overall effect on herd reproductive performance.

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Relationship of Late Embryo Loss and Anomalies in Broiler Offspring

The Journal of Applied Poultry Research ◽

10.1093/japr/16.1.62 ◽

2007 ◽

Vol 16 (1) ◽

pp. 62-69

Author(s):

R.W. Keirs ◽

E.D. Peebles ◽

P.D. Gerard

Keyword(s):

Embryo Loss ◽

Relationship Of ◽

Late Embryo

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Pengaruh ovaprim, aromatase inhibitor, dan hipofisa terhadap kualitas telur ikan Lele Dumbo (Clarias gariepinus)

e-Journal BUDIDAYA PERAIRAN ◽

10.35800/bdp.5.1.2017.14836 ◽

2017 ◽

Vol 5 (1) ◽

Author(s):

Erwin A. Aziz ◽

Ockstan Kalesaran

Keyword(s):

Survival Rate ◽

Experimental Design ◽

Aromatase Inhibitor ◽

Fish Larvae ◽

Clarias Gariepinus ◽

Randomized Design ◽

Completely Randomized Design ◽

The Difference ◽

Hatching Eggs

This study aimed to determine the effect of ovaprim hormone, aromatase inhibitor and pituitary on the quality of the catfish eggs (Clarias gariepinus). Experimental Design used was Completely Randomized Design (CRD) with four treatments, each with three replications. Treatment A: ovaprim; treatment B: Aromatase inhibitors, treatment C: hypophysis and treatment D: Control. The results showed that the difference in treatment gave highly significant effect on fertilization and hatching eggs but no significant effect on the survival rate of larvae. Aromatase inhibitor hormone was the best because it provided highly significant effect on fertilization (92.66%), hatchability of eggs (95%), and surviva rate (81.33%) of fish larvae. Keywords : Clarias gariepinus. Ovaprim, Aromatase Inhibitor, Hypophysis, egg, larvae

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