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Reproductive Management for Beef Females Cliff Lamb Assistant Director and Professor.

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Presentation on theme: "Reproductive Management for Beef Females Cliff Lamb Assistant Director and Professor."— Presentation transcript:

1 Reproductive Management for Beef Females Cliff Lamb Assistant Director and Professor

2 Semen Sales in USA and Brazil from 1995 to 2011 (NAAB and ASBIA, 2011)

3 Estrous Synchronization and AI in Beef Cattle

4 Definitions Synchronization Rate: % of females detected in estrus compared to total number synchronized. Conception Rate: % of females pregnant compared to number of females inseminated. Pregnancy Rate: % of females pregnant compared to total number synchronized.

5 Effect of synchronization rate on pregnancy rates

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7 TAI in Bos taurus cows

8 Cidirol

9 TAI in Bos taurus heifers

10 Cidirol

11 Can we resynchronize estrus in non-pregnant cows?

12 CIDR Heat detect and AI TAI Protocol for Resynchronization after TAI - Cows d Co-Synch + CIDR protocol Days relative to TAI

13 CIDR Heat detect and AI TAI Protocol for Resynchronization after TAI - Heifers d Co-Synch + CIDR protocol Days relative to TAI

14 Protocol for Resynchronization after TAI (Larson et al., 2009)

15 Does estrous synchronization affect subsequent fertility?

16 Answers to field results from commercial producers 438 suckled cows were estrous synchronized using the 7-day CO-Synch + CIDR Protocol. PGFGnRH TAI & GnRH CIDR

17 n=275 n=85 n=37n=34 90% Overall pregnancy rate ?? Pregnancy Rates

18 97.5% return to estrus rate!! Estrus response of cows following the 7-day CO-Synch+CIDR protocol Average Interval to estrus = 20.9 days

19 Economics of implementing TAI program

20 (Rodgers et al., 2011) Control CIDR Natural mating GnRHPGF TAI + GnRH TAI Natural mating Impact of Fixed-Time AI on Calving and Weaning

21 (Rodgers et al., 2011)

22 Impact of Fixed-Time AI on Calving Distribution 44% vs. 25%

23 Impact Calving Distribution on Calf Value

24 Treatment ItemControlTAI No. of cows Weaning rate, %7884 Weaning weight, lb176 ± 4 a 193 ± 4 b ab Means within row differ (P < 0.01) Impact of Fixed-Time AI on Calving and Weaning (Rodgers et al., 2011) 17 kg

25 (Rodgers et al., 2011)

26 Change in value based on herd sire costs Bull Value Item$2,500$3,500$4,500 Increased returns (increased value of AI calves) $58.33 Decreased costs decreased costs of clean-up bulls) $29.55$39.29$49.04 Decreased returns (Attributed to fewer clean-up bulls included in decreased costs calculation) $0.00 Increased costs (additional labor, semen, AI supplies, etc.) $46.10 Gain per cow exposed to AI$41.78$51.52$61.27

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31 Can I use sexed semen in beef cattle operations?

32 Semen sorting overview Nozzle Forward Fluorescence Photodiode DNA Content Laser beam Sort Receptacle Waste Catcher Charged Deflection Plates Last Attached Drop Pulse of Charge Applied Drop Delay Side Fluorescence Orientation Objective

33 Gender ratio after 20% of cows are inseminated to sexed semen (Hall et al., 2010)

34 Embryo Production of Superovulated Angus Cows Category ** ** Treatments differ (P < 0.05) 32.4% 49.5%

35 Recommendations for Embryo Transfer  Utilize only in donors cows with known prolific production (average >10 transferable embryos per collection).  Inseminate at 0, 12, and 24hr after estrus.  Do not expect similar fertilization rates to conventional semen.

36 Heifer Development

37 (Lesmeister et al., 1973) Relationship between time of calving and lifetime production

38 (Cushman et al., 2012) Influence of calving period on reproductive longevity

39 (Cushman et al., 2012) Influence of calving period on weaning weights

40  Body weight  Age  Genetics  Nutrition  Reproductive management  Rate of gain  Plane of nutrition  Body composition  Animal handling Factors affecting attainment of puberty

41  Body weight  Age  Genetics  Nutrition  Reproductive management  Rate of gain  Plane of nutrition  Body composition  Animal handling Factors affecting attainment of puberty

42  Body weight  Age  Genetics  Nutrition  Reproductive management  Rate of gain  Plane of nutrition  Body composition  Animal handling Factors affecting attainment of puberty

43 Effect of timing of gain on attainment of puberty and reproductive performance Lynch et al., 1997 JAS 75:

44 ADG, kg/d d0-112 EVENGAIN LATEGAIN – 0.11 ADG, kg/d d EVENGAIN – 0.45 LATEGAIN – 0.91 ADG, lbs/d d0-168 EVENGAIN – 0.45 LATEGAIN – 0.45 EVENGAIN LATEGAIN Effect of Timing of Gain on Reproductive Performance (Lynch et al., 1997)

45 ADG, kg/d d0-112 EVENGAIN LATEGAIN – 0.26 ADG, kg/d d EVENGAIN – 0.80 LATEGAIN – 0.95 ADG, lbs/d d0-168 EVENGAIN – 0.57 LATEGAIN – 0.49 EVENGAIN LATEGAIN Effect of Timing of Gain on Reproductive Performance (Lynch et al., 1997) Year 1

46 ADG, kg/d d0-112 EVENGAIN LATEGAIN – 0.05 ADG, kg/d d EVENGAIN – 0.74 LATEGAIN – 1.30 ADG, lbs/d d0-168 EVENGAIN – 0.53 LATEGAIN – 0.50 EVENGAIN LATEGAIN Effect of Timing of Gain on Reproductive Performance (Lynch et al., 1997) Year 2

47 Effect of Timing of Gain on Reproductive Performance Item EVENGAIN LATEGAIN Age at puberty, d Year Year a 407 b Weight at puberty, kg Year Year (Lynch et al., 1997) ab Means within row differ (P < 0.01)

48 Effect of Timing of Gain on Reproductive Performance Item EVENGAIN LATEGAIN First service PR, % Year Year Overall PR, % Year Year (Lynch et al., 1997)

49 Estrous cyclicity responses of heifers of distinct body conditions to energy restriction and repletion. Cassady et al., 2009, JAS 87: and JAS

50 BCS 3 BCS 5 BCS 7

51 Design BCS 5 RestrictionRe-feeding Termination of estrous cycles Resumption of estrous cycles ?? (FAT) (MODERATE) Cassady et al., (2009)

52 Treatments ItemMODERATEFAT Initial BW, kg 425 a 515 b Initial BCS 5.0 a 7.1 b BW at anestrus, kg BCS at anestrus Days to anestrus 66.5 a b Change in BW, BCS and days to anestrus during feed restriction Cassady et al., (2009)

53 Treatments ItemMODERATEFAT BW at anestrus, kg BCS at anestrus BW at 1 st estrous cycle, kg 455 a 513 b BCS at 1 st estrous cycle 5.2 a 6.0 b Days to 1 st estrous cycle Change in BW, BCS and days to 1 st estrous cycle after initiation of feed repletion Cassady et al., (2009)

54 Conclusions BCS 7 BCS 5 BCS 3 BCS 6 BCS 5 RestrictionRe-feeding Cassady et al., (2009)

55 The impact of animal handling on fertility

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57 Acclimation of Heifers Acclimation of Heifers Cooke et al. (2009) P < 0.01 **

58 Acclimation of Heifers Acclimation of Heifers Pregnancy during the breeding seasonPregnancy during the breeding season Cooke et al. (2009) P < 0.01 **

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60 Acclimation of Heifers Acclimation of Heifers Cappellozza et al. (2011) – Abstract #545 Treatment x Month P = 0.02 ** P < 0.01 **

61 Thank You! Contact Information: Cliff Lamb University of Florida 3925 HWY 71 Marianna, FL Tel:


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