New Tools for Estrous Synchronization – New Tools for Estrous Synchronization – Costs and BenefitsCosts and Benefits

Doug Zalesky, Ph.D and Ryon WalkerDoug Zalesky, Ph.D and Ryon Walker

San Juan Basin Research CenterSan Juan Basin Research Center

Colorado State UniversityColorado State University

2003 Range Beef Cow Symposium2003 Range Beef Cow Symposium

Mitchell, NEMitchell, NE

PG Protocols

PG PG ****Heat Detect&AI***

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1 11

***Heat Detect&AI*** PG *******Heat Detect&AI****

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5

Treatment days

MGA Protocols

Estrus

MGA (14 days) Natural Service

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1 14 16 20 24

Treatment days

MGA-PG Protocols

Synchronized

Estrus Estrus

MGA (14 days) PG

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1 14 16 20 33 35 38

Treatment days

Distribution of estrus comparing the MGA-PG and MGA-only systems (Patterson et al., 2001)

% of herd in estrus

MGA-PG

(AI)

MGA

(Natural Service)

GnRH – PG Protocols

Ovsynch

GnRH PG GnRH AI

_____________________________________________1 7 9 16-24 h

Treatment days

GnRH – PG Protocols

CO-Synch

GnRH PG GnRH&AI

_____________________________________________1 7 9

Treatment days

GnRH – PG Protocols

Select Synch

GnRH PG

****** **Heat Detect & AI*****

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1 9

Treatment days

MGA Select Protocol

MGA (14 days) GnRH PG

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1 14 26 33

Treatment days

7-11 Synch Protocol

PG

MGA GnRH PG

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1 7 11 18

Treatment days

Comparison of estrus response and fertility in postpartum beef cows after treatment with various estrus

synchronization protocols. (Patterson et al., 2001)

30/44 68%40/44 91%7-11 Synch

70/115 61%Fixed Time AIMGA Select + GnRH at AI

134/204 66%174/204 85%MGA Select

130/206 63%161/206 83%MGA-PG 14-19d

243/348 70%327/348 93%MGA-2 shot PG

220/408 54%305/408 75%MGA-PG 14-17d

237/528 45%353/528 67%Select Synch

147/422 35%241/422 57%2 shot PG

Synchronized pregnancy rate

Estrus Response

Treatment

CIDR + PG ProtocolCIDR + PG Protocol

Day 0 Day 6 Day 7

CIDRCIDR

Lutalyse

CSU CIDR StudiesCSU CIDR Studies

Heifer Study:

375 crossbred heifers

3 herds: San Juan Basin Research Center - Colorado

Beef Improvement Center - Wyoming

Quinn Cattle Co. – South Dakota

CSU CIDR StudiesCSU CIDR Studies

Heifer Study:

Modified Co-Synch – CIDR

CIDR Insert CIDR Removal 54 h Timed

GnRH PG AI

Trt 1 = No GnRH

Trt 2 = GnRH

Day 0 Day 7 Day 9

CSU CIDR StudiesCSU CIDR Studies

Heifer Results:

Location Number Trt 1 Trt 2 Overall

PR, % PR, % PR, %

S. Dakota 211 40.4 54.2 47.4

SJBRC 39 52.6 55.0 53.9

BIC 125 54.0 56.5 55.2

Pooled 375 46.2 55.0 50.6

CSU CIDR StudiesCSU CIDR Studies

Cow Study

583 head (Angus and Red Angus crossbreds)

2 herds: San Juan Basin Research Center – Colorado

Beef Improvement Center - Wyoming

CSU CIDR StudiesCSU CIDR Studies

CIDR Insert CIDR Removal+PG 54 h Timed AI GnRh Trt 1 = No Calf Removal on remaining Trt 2 = Calf Removal

cows

Day 0 Day 7 Day 8 Day 9

Heat Detect &Breed

CSU CIDR StudiesCSU CIDR Studies

Cow Study

SJBRC BIC Pooled

Heats n %Preg n %Preg n %Preg

Trt 1 16 62.5 29 62.1 45 62.2

Trt 2 27 77.8 52 67.3 79 70.9

CSU CIDR StudiesCSU CIDR Studies

Cow Study

SJBRC BIC Pooled

TAI n %Preg n %Preg n %Preg

Trt 1 85 40.0 160 42.5 245 41.6

Trt 2 77 28.6 137 36.5 214 33.6

CSU CIDR StudiesCSU CIDR Studies

Cow Study

SJBRC BIC Pooled

Total n %Preg n %Preg n %Preg

Trt 1 101 43.6 189 45.5 290 44.8

Trt 2 104 41.3 189 45.0 293 43.7

Overall 205 42.4 378 45.2 583 44.3

Synchronization System CostsSynchronization System CostsPG = $1.57 GnRH = $2.50 MGA = $0.02/hd/d CIDR = $8.00

Protocol Cost Type %CR %PR

2 X PG $3.14 Cows 60.6

S. Synch $4.07 Cows 65.7

Co-Synch $6.57 Cows 49.0

Ovsynch $6.57 Cows 57.0

MGA+PG $1.85 Cows 63.0

MGA Sel. $4.35 Cows 66.0

7-11 Synch $5.78 Cows 47.0

Synchronization System CostsSynchronization System CostsPG = $1.57 GnRH = $2.50 MGA = $0.02/hd/d CIDR = $8.00

Protocol Cost Type %CR %PR

CIDR + PG $9.57 Cows 61.0

CSU Study $12.07 Cows 44.3

$14.57 Heifers 50.6

Benefits of CIDRBenefits of CIDR

1. No heats during treatment – no early estrus

2. High concentration of heats within a short time period (24-48 h post CIDR removal)

* allows for use of TAI

* reduces amount of time for heat detection

3. Ease of use – both insertion and removal

AppreciationAppreciation

Pharmacia & Upjohn – CIDR’s and Lutalyse

Intervet, Inc. – Fertagyl

Select Sires – semen

Quinn Cattle Co. - Chadron, NE

Beef Improvement Center – Saratoga, WY

San Juan Basin Research Center Staff