1996 NCBA-IRM-SPA COW-CALF ENTERPRISE SUMMARY OF REPRODUCTION AND PRODUCTION PERFORMANCE MEASURES FOR C.H.A.P.S. COW-CALF PRODUCERS


(1)K. Ringwall and K. Helmuth

Dickinson Research Extension Center
North Dakota State University


ABSTRACT

Being competitive in current beef production requires that producers understand all details of their working operation. The North Dakota State University Extension Service in cooperation with the North Dakota Beef Cattle Improvement Association provide managerial reports generated through the Cow Herd Appraisal of Performance Software (CHAPS III). These reports assist producers with total herd evaluations which are utilized in North Dakota's Integrated Resource Management (IRM) program. For more effective utilization of individual herd data, production benchmark values utilizing the NCBA-IRM-SPA calculations were obtained from 206 beef cow herds with a total of 106,476 cows exposed to bulls and processed through CHAPS III from 1991 to 1995.

INTRODUCTION:

Performance and production data need to be collected and utilized for a sound beef operation to function in the 90's. The collection of data, such as birth date, birth weight, weaning weight, etc., is a common event, however the utilization of the data may vary considerably from one beef producer to the next. The purpose of this paper is to enhance the beef producer's ability to evaluate production records and increase the understanding and utilization of production data within the operation.

Beef performance data actually only comes in one form, but with two purposes. The purpose that most producers first think of and relate to, is performance data. Performance data is used within genetic evaluation programs to estimate the direction of genetic change and allows for accurate cow culling, heifer selection and bull buying. The second purpose is the appraisal of overall cow herd productivity which allows a beef producer to evaluate management decisions for the past year through changes in overall cow herd output. In other words, do the management regimes and selected individuals actually perform at the expected level.

The beef producer needs to first incorporate into the cow herd the CHAPS (Cow Herd Appraisal of Performance System) evaluation program and focus on both individual performance as well as overall herd productivity. The following evaluations are provided by CHAPS on individual performance data. The calf output is divided by sex and provides birth date, birth weight, calving ease, actual weaning weight, age in days, adjusted 205 day weight, adjusted 205 day weight ratio, frame score, average daily gain, weight per day of age, calf grade and parentage information on each calf. Averages presented are within sex and include an overall sex group average, individual sire averages and cow breed averages for all traits recorded.

A separate sire summary is included to provide trait averages by sire for birth weight, calving ease, actual weaning weight, adjusted 205 day weight, average daily gain, weight per day of age, calf age and frame score. Most probable producing ability (MPPA) values are calculated for all cows within the herd. The cow summaries include the cow identification, age of cow, cow breed, MPPA, number of calves born, number of calves weaned, calving interval and sire of cow. All previous years individual calf records are available for review if needed.

The appraisal of overall cow herd productivity is accomplished within CHAPS through summarizing the calf data. The herd summary includes a reproductive analysis of the herd, a calving distribution report, an overall growth report, herd uniformity score and a cow culling report. The herd comparison report identifies those factors which are critical to the operation of the beef business. The last report includes the NCBA-IRM-SPA cow-calf summary of reproduction and production performance measures values. The NCBA-IRM-SPA performance values are standardized calculations based on guidelines established by National Cattlemen's Beef

Association National Integrated Resource Management Coordinating Committee Cow-Calf Financial Analysis Subcommittee.

MATERIALS AND METHODS:

The North Dakota Beef Cattle Improvement Association has processed beef cattle records since 1963. Individual calf records for 206 beef cow herds during 1991 to 1995 are processed through the CHAPS III computer program. One hundred six thousand four hundred seventy six (106,476) individual records of cows exposed to bulls are combined into one large data set to generate typical CHAPS beef cow herd performance.

RESULTS AND DISCUSSION:

Although a producer's natural instinct is to review the individual performance data first, the initial step should be to review the overall herd productivity data. Once the total operation has been evaluated, the beef producer can initiate changes to the operation. Generally, the operation

will need to modify some combination of management and cattle genetics. Annual trends in NCBA-IRM-SPA production measures during 1991 to 1995 are listed in Table 1. Benchmark five year rolling average values are in Table 2. Table 3 summarizes the mean values for the top, middle, and bottom one-thirds for the 206 beef cow herds processed through CHAPS III from 1991-1995. These NCBA-IRM-SPA reproduction and performance values are presented to encourage producers to critically evaluate their own operations. As each value is reviewed, a producer should ask if that information is available for their operation. If the data is available, the producer should then compare their operation to the data presented. If the data is not available, the producer should then consider how the data might be obtained.

Individual cow as well as herd performance records are a valuable and necessary tool for making accurate selection and culling decisions. However, beef producers must realize that these records need to be utilized in a comprehensive evaluation of herd productivity in order for the beef cattle operation to discover the greatest efficiency and profitability.



Table 1. Annual NCBA-IRM-SPA Cow-Calf Enterprise Summary of Reproduction and Production Performance Measures.

Calving Distribution Average
Year Pregnancy Percentage Pregnancy Loss Percentage Calving Percentage Calf Death Loss Calf Crop Female Replacement Rate Percentage Death Loss 21 42 63 Late Calf Age Wean Wt. Pounds Weaned per Exposed cow
1991 94.4 0.4 94.0 2.7 91.6 17.8 2.9 57 87 95 5 200 556 510
1992 94.9 0.2 94.7 3.3 91.4 17.7 3.5 57 83 94 6 202 569 522
1993 94.1 0.4 93.7 4.0 90.1 21.6 4.3 59 87 96 4 202 588 521
1994 94.3 0.6 93.7 3.8 90.3 20.0 4.1 60 87 96 4 202 559 497
1995 92.8 1.0 91.8 3.9 88.7 21.0 4.3 58 86 95 5 200 561 489




Standard

Mean Deviation

Reproduction Performance Measures:

Pregnancy Percentage 94.0 3.9
Pregnancy Loss Percentage .6 1.1
Calving Percentage 93.5 4.1
Calf Death Loss 3.6 3.3
Calf Crop or Weaning Percentage 90.5 5.4
Female Replacement Rate Percentage 19.8 9.1
Calf Death Loss: Based on Number of Calves Born 3.9 3.6
Calves Born During First 21 Days 58.3 17.2
Calves Born During First 42 Days 86.0 12.2
Calves Born During First 63 Days 95.5 6.7
Calves Born After First 63 Days 4.5 6.7

Production Performance Measures:

Average Age at Weaning (Days) 201 22.0
Actual Weaning Weight for Steers 577 63.7
Actual Weaning Weight for Heifers 548 55.7
Actual Weaning Weight for Bulls 616 85.3
Average Weaning Weight 567 58.4
Weight Weaned per Exposed Female 508 67.3

Culling Percentages Based on Total Cows Exposed

Total Percent Culled 13.1 8.2
Percent Dead .7 .9
Percent Culled Due to Age 2.1 3.5
Percent Culled Due to Defects 1.5 2.5
Percent Culled Due to Poor Fertility or Open 4.3 3.4
Percent Culled Due to Inferior Calves 1.4 2.9
Percent Culled for Replacement Stock 2.1 5.9
Percent Culled for Unknown Reasons 1.1 3.8

Table 3. CHAPS NCBA-IRM-SPA cow-calf enterprise mean values for the top, middle and bottom thirds for reproduction and performance measures. Selected on age adjusted weight weaned per exposed female.

Top Middle Bottom

Third Third Third

Reproduction Performance Measures:

Pregnancy Percentage 94.7 94.4 92.6
Pregnancy Loss Percentage .4 .6 .6
Calving Percentage 94.4 93.9 92.0
Calf Death Loss 2.5 3.5 5.0
Calf Crop or Weaning Percentage 92.6 91.0 87.6
Female Replacement Rate Percentage 18.5 21.0 20.8
Calf Death Loss: Based on Number of Calves Born 2.6 3.8 5.5
Calves Born During First 21 Days 59.8 58.0 55.3
Calves Born During First 42 Days 87.7 85.7 82.0
Calves Born During First 63 Days 96.7 95.4 92.5
Calves Born After First 63 Days 3.3 4.6 7.5

Production Performance Measures:

Average Age at Weaning (Days) 194 202 212
Actual Weaning Weight for Steers 600 571 553
Actual Weaning Weight for Heifers 570 549 525
Actual Weaning Weight for Bulls 640 615 580
Average Weaning Weight 591 568 541
Weight Weaned per Exposed Female 546 513 462

Age Adjusted Weight Weaned Per Exposed Female 565 511 438

Culling Percentages Based on Total Cows Exposed

Total Percent Culled 12.4 12.5 14.1
Percent Dead .5 .6 1.0
Percent Culled Due to Age 2.0 2.1 2.2
Percent Culled Due to Defects 1.5 1.1 1.6
Percent Culled Due to Poor Fertility or Open 4.0 4.0 5.0
Percent Culled Due to Inferior Calves 1.1 1.4 1.5
Percent Culled for Replacement Stock 1.8 2.4 1.6
Percent Culled for Unknown Reasons 1.6 0.9 1.4

1. Kris Ringwall, PhD, Director, Dickinson Research Extension Center. Keith Helmuth, Research Specialist, Dickinson Research Extension Center, Dickinson, ND.

kringwal@ndsuext.nodak.edu

khelmuth@ndsuext.nodak.edu