# Presentation: 143313

##  NAAB Update:Base Change, Udder Health, Longevity, Fertility

## Genetic Gain 1995-2000

|  | HO | JE | BS | GU | AY | MS |
| --- | --- | --- | --- | --- | --- | --- |
| Protein | 19 | 16 | 16 | 12 | 8 | 6 |
| Fat | 18 | 16 | 20 | 16 | 9 | 6 |
| Milk | 588 | 448 | 480 | 426 | 259 | 233 |
| Prod. Life | .3 | .4 | .4 | .2 | .2 | .6 |
| SCS | .01 | .01 | -.04 | .02 | -.01 | .02 |
| DPR | -.1 | -.2 | -.2 | -.2 | .0 | .0 |

## SCS and DPR Breed Means

|  | HO | JE | BS | GU | AY | MS |
| --- | --- | --- | --- | --- | --- | --- |
| 1995 SCS | 3.10 | 3.31 | 3.09 | 3.21 | 2.93 | 3.03 |
| 2000 SCS | 3.09 | 3.34 | 2.94 | 3.31 | 2.97 | 3.07 |
| SCS mean diff. | -.01 | .03 | -.15 | .10 | .04 | .04 |
| 1995 cow DPR | .4 | .2 | .6 | -.3 | -.1 | .5 |
| DPR change | -.3 | .0 | -.4 | .5 | .1 | -.5 |

## Udder Health Scales

| Ctry | Unit | Mean | SD | Dir | Ctry | Unit | Mean | SD | Dir |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| USA | PTA | 3.1 | .22 | - | NLD | RBV | 100 | 4 | + |
| CAN | PTA | 3.0 | .25 | - | DNK | RBV | 100 | 5 | + |
| BEL | EBV | 3.0 | .47 | - | SWE | RBV | 100 | 7 | + |
| JPN | EBV | 2.4 | .42 | - | DEU | RBV | 100 | 12 | + |
| AUS | EBV | 0 | .11 | - | ITA | STA | 4 | 1 | + |
| GBR | PTA | 0 | 13 | - | FRA | STA | 0 | 1 | + |
| HUN | STA | 0 | 1 | - | ESP | STA | 0 | 1 | + |

## Convert SCS to Udder Health?

**PTA UH = -5 (PTA SCS – breed avg)**
**Reversed scale with mean 0, SD 1**
**Interpreted like linear trait STA’s**
**Positive numbers are favorable**
**Range similar to DPR, PL**
**Udder Health is term of Interbull**

## Longevity Trend Testing

**USA Method 2 results (DYD trend)**
**HO bias = -.006, < limit = .035**
**BS, GU bias (-.035, .032) near limit**
**JE, AY bias (-.072, -.089) over limit**
**Method 3 (data cutoff) OK for HO**
**Interbull rejected 5 of 15 countries**

## Use of MACE Longevity

**Compare USA and MACE REL **
**MACE for single-trait (direct) PL only**
**AIPL then combines other trait info **
**Label multi-trait PL as MACE**
**Get foreign bull DPR from MACE PL**
**Better PL implies better DPR**
**Predict foreign DPR from PL, SCS, etc**

## Single vs Multi-Trait PL

**Used Nov ‘01 to predict Feb ’04 PTA PL **
**5%**** benefit expected, ****3%**** observed**
**547 bulls born >1995 (before vs after 1****st**** crop daus)  **
**.1 decline in multi-trait PTA PL**
**3%**** benefit expected, ****1%**** observed**
**309 bulls born 1992-94 (1****st**** vs 2****nd**** crop daus)**
**.4 decline in multi-trait PTA PL**
**Yield correlations have been reduced**
**Fertility correlation now included**

## Cows Sold Before 1st Test

**Some contribute to PL (since 2004)**
**Database modified to store fresh dates with 0 tests (like heifers)**
**1 DRPC does not receive these,  may be partial reporting (also CE?)**
**PL daus > milk daus for more bulls**

## Yield Trait Scales

**Age-parity adjustments differ **
**16 of 25**** countries adjust to average parity**
**5**** adjust to mature, ****4**** adjust to 1st parity**
**Separate lactation proofs available**
**True protein in ****5 of 21**** countries:**
**AUS, FRA, HUN, POL, USA (as of 2000)**
**True% = Crude% - .19 (e.g. 3.00% vs 3.19%)**
**Protein yield (kg) reduced by 5-6%**

## Adjust Yield to Average Age?

**Proposed by USDA in 1994**
**Recommended by Holstein GAC, Oct 1994**
**Vetoed by Council “to allow the industry time to consider the nature and effect of such a change.”**
**Mature EBV kg = 36 mo PTA lb**
**PTA lb / EBV kg = 2.2 / 2 = 1.1**
**Reduced age divides by 1.1**
**New Holstein base SD will multiply by 1.11**
**Other breed SD increase by 1.05 to 1.18**

## Conformation Scales

**Standardized Transmitting Ability**
**Mean = 0, SD = 1**
**9 of 21**** countries: CHE, CZE, DNK, FRA, HUN, GBR, ITA, JPN, USA**
**Relative Breeding Values**
**Mean = 100, SD = 4, 7, 10, 12**
**8**** countries in northern Europe**
**PTA, EBV, or other (****4**** countries)**
**Convert USA minor breeds from PTA to STA?**