Reproduction

Reproduction - Reproduction Goats Female Age of Puberty...

Info iconThis preview shows pages 1–13. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Reproduction Goats Female Age of Puberty 7-10 Months Breeding Weight 60-75% of Adult Weight Estrous Cycle 18-22 Days (Avg 20 days) Estrus Duration 12-36 hrs (Avg 24 hrs) Ovulation 12-36 hrs from onset (Avg 24 hrs) Gestation Length 146-155 days (Avg 150 days) Signs of Estrus: Tail wagging, Mounting, Bleating Reproduction Sheep Female Age of Puberty 5-12 Months Breeding Weight 60-75% of Adult Weight Estrous Cycle 14-20 Days (Avg 17 days) Estrus Duration 20-42 hrs (Avg 30 hrs) Ovulation 20-42 hrs from onset (Avg 30 hrs) Gestation Length 144-152 days (Avg 148 days) Signs of Estrus: Tail wagging, Mounting, Bleating Reproduction Reproduction Hormones Estrogen- Steroid hormone, Excitatory, follicles Progesterone- Steroid hormone, corpus luteum Luteinizing Hormone (LH )- stimulates ovulation and CL growth Follicle Stimulating Hormone (FSH ) follicular growth Gonadotropic Releasing Hormone (GnRH ) stimulates release of FSH & LH Prostaglandins- induces the regression of the corpus luteum ; lutalyse Reproduction Gestation period The medium-wool and meat-type breeds - shorter gestation period than fine-wool breeds. High temperatures and high nutrition levels may shorten the gestation period two or three days. Ewes bred to white-faced, wool-breed rams may have a slightly longer gestation period than those bred to black-faced, meat-type rams. Factors affecting Reproduction Heredity Age Photoperiod (seasonal) Temperature and humidity Nutrition and Exercise Parturition and lactation Disease and parasites Fertility of & assoc. with the ram Reproduction Breeding ewe lambs Ewe lambs that lamb as yearlings - greater lifetime production than ewes that lamb as 2 year olds. Onset of puberty depends largely upon body weight Nutrition Two-thirds of mature weight Reproduction Ewes that lamb as yearlings Separate from mature ewes manage and feed Reach potential size shy breeders breed them separate from older ewes use rams of smaller breeds lambing difficulties Reproduction Breeding Season Melatonin hormone that controls sheep breeding cycles produced during the hours of darkness In mid to northern latitudes breeding is strongly seasonal photoperiod - the determining factor environmental temperature nutritional status social interactions Reproduction...
View Full Document

Page1 / 36

Reproduction - Reproduction Goats Female Age of Puberty...

This preview shows document pages 1 - 13. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online