3 Fall Lambing 10 25 06

Fall Lambing: Overcoming Seasonality of the Ewe ,[object Object],[object Object]

[object Object],[object Object],[object Object],Questions for Today

Why do we see seasonal reproductive activity in the ewe? ,[object Object],[object Object]

Why do we see seasonal reproductive activity in the ewe? ,[object Object],[object Object],[object Object]

Anovulatory Breeding Pregnancy Lambing Anovulatory Seasonal Breeding Cycle in Sheep Winter Fall Summer Summer Spring Decreasing Day Length Increasing Day Length Geisert, 1999

Why are sheep seasonal breeders? ,[object Object],[object Object],[object Object],[object Object]

Day Length Melatonin Production COMMUNCIATION VIA HORMONES BRAIN REPRODUCTIVE TRACT Decreasing Daylight STIMUALTION

Day Length Melatonin Production COMMUNCIATION VIA HORMONES BRAIN REPRODUCTIVE TRACT Increasing Daylight SUPPRESSION

[object Object],[object Object],[object Object],What does seasonal reproduction do to the supply of lamb throughout the year?

How does seasonality effect the supply of lamb? Jan Feb Mar Apr May Jun Jul Aug Sep Oct U.S. Monthly Lamb Slaughter in 2004 and 2005 Source: USDA/NASS Nov Dec 175 200 225 250 275 1,000 head Sheep and lamb slaughter Dollars per cwt 95 100 105 110 90 Slaughter lamb prices

What are the benefits of overcoming seasonality? ,[object Object],[object Object]

What are the benefits of overcoming seasonality? ,[object Object],[object Object],[object Object]

What are the benefits of overcoming seasonality? ,[object Object]

What are the benefits of overcoming seasonality? Jan Feb Mar Apr May Jun Jul Aug Sep Oct U.S. Monthly Lamb Slaughter in 2004 and 2005 Source: USDA/NASS Nov Dec 175 200 225 250 275 1,000 head Sheep and lamb slaughter Dollars per cwt 95 100 105 110 90 Slaughter lamb prices

What are the benefits of overcoming seasonality? Jan Feb Mar Apr May Jun Jul Aug Sep Oct Source: USDA/NASS Nov Dec 1 2 3 4 5 Relative no. of head Sheep and lamb slaughter Potential North Dakota Monthly Lamb Slaughter Relative dollars per cwt 2 3 4 5 1 Slaughter lamb prices

How can we overcome seasonality in ewes? Normal percentage of ewes in heat per month

What methods can be used to overcome seasonal reproduction in the ewe? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],ARTIFICAL NATURAL

Ram introduction ,[object Object],[object Object]

Ewe lamb selection ,[object Object],[object Object],[object Object]

Ewe lamb selection ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Natural Techniques ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What methods can be used to overcome seasonal reproduction in the ewe? ,[object Object],[object Object],[object Object],[object Object],NATURAL ARTIFICAL

Endocrine Control of Estrous Cycle in the Ewe

Progestins: How they work Day of estrous cycle 1 3 6 9 12 15 18 21 Day of estrous cycle 1 3 6 9 12 15 17 ,[object Object],[object Object],[object Object]

Artificial Techniques ,[object Object],[object Object],[object Object]

Progestins ,[object Object],[object Object],[object Object],[object Object],[object Object],CIDR™

Progestins: CIDR Day of estrous cycle 1 3 6 9 12 15 18 21 Days -12 -6 0 2 Insert CIDR on day -12 Remove CIDR on day 0 Heat in 1-2 days

Progestins ,[object Object],[object Object],[object Object],[object Object],[object Object]

Progestins: MGA Day of estrous cycle 1 3 6 9 12 15 18 21 Days -12 -6 0 2 Start feeding MGA on day -12 Stop feeding MGA on day 0 Heat in 1-2 days

Gonadotropins: How they work Day of estrous cycle 1 3 6 9 12 15 18 21 Day of estrous cycle 1 3 6 9 12 15 17 ,[object Object],FSH

Gonadotropins ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Gonadotropin: PG600 (with CIDRs) Day of estrous cycle 1 3 6 9 12 15 18 21 Days -12 -6 0 2 Insert CIDR on day -12 Remove CIDR on day 0 Heat in 1-2 days Administer shot of PG600 on day 0

Artificial Techniques ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Summary ,[object Object],[object Object],[object Object]

3 Fall Lambing 10 25 06

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3 Fall Lambing 10 25 06