Posts Tagged ‘calf and growth and weight’

Typical Grain Veal Growth

The aim of beef production is to produce a high quality product with maximum efficiency.

Factors that affect the carcass composition and carcass yield are:

  • Weight and age
  • Genotype
  • Gender
  • Growth rate and nutrition
  • Conformation

A typical growth curve involves a self-accelerating phase of weight increase from birth to puberty of the animal. During this phase, growth hormones are mainly responsible for the growth process. The second phase of growth (puberty to adulthood) has lower rates of weight increase and is controlled mostly by the different sex hormones.

Relative growth of different body parts, tissue types, etc. take place according to an allometric growth equation.  The development order is consistent with survival of the animal in the early stages of life. I.e. brain, bone tissue, muscle tissue and fat will develop in this order.

Low fat levels in the young calf, due to its young age, can have serious implications in its survival and growth rate potential.

Distribution of muscle weight, together with bone and fat proportions, will determine the quality of the carcass. Quality of the meat product is a function of maximum edible yield (muscle and fat) with minimum waste (bone and excess fat) according to consumer preference. Knowledge of growth patterns and factors affecting them can be used for effective economic meat production.

Holstein calves fed as grain-fed veal represent the most uniform group of cattle marketed in the beef industry.
The nutrient requirements for grain-fed veal have not been researched to the extent of the other animal species.

The key to successful growth rates is to plan a feeding strategy from birth for every stage of rearing to match a breeds genetic potential. Growth rates are also affected by the environment and health status.

TYPICAL GAINS FOR VEAL CALVES: GROBER VG MILK REPLACER

Week Live- weight (kg) AverageVG powder (g/day) Av. Calf starter (22%)
(g/day)
Energy allowable gain (kg/day) Protein allowable
gain (kg/day)
1 40 500 - 0.3 0.3
2 45 600 50 0.43 0.4
3 50 750 200 0.67 0.59
4 55 750 400 0.74 0.68
5 60 750 500 0.74 0.73
6 65 500 1000 0.74 0.78

Andre Roy MSc.
Sally Charlton BSc. (Hons)
 April 2003

 

Heifer – Holstein Growth Targets

We most often concentrate on milking cows to meet financial and milk supply commitments and to let the herd replacements take a back seat. Replacement heifers are tomorrow’s profit earners and deserve as much detailed attention as the milking herd. Managing the growth of replacement heifers to achieve sufficient body size and yet assure optimum mammary development is a concern among dairy research institutions, nutritionists and dairy producers.

The improved genetic heifer or modern Holstein heifer that has the potential to calve at 24 months of age has specific growth, weight and height targets throughout her growing phase. To achieve early maturation of the reproductive tract, heifers must be fed to attain rapid body weight gains during the growth period.

There are three phases of heifer development:

  • Prepuberty
  • Puberty/conception
  • Late gestation.

It is evident that:

  • The rate of growth during the rearing period influences milk yield,
  • The level of nutrition around the time of service affects pregnancy rates and
  • The management of the heifer at calving influences the incidence of dystocia and calf mortality.

Attention to detail and good management throughout the rearing period has a considerable effect on longevity and overall herd profitability. The onset of puberty is largely a function of bodyweight.

CALF REARING TARGETS (HOLSTEIN-0-3 MONTHS)

  Targets
Calf birth weight (kg) 40
Mature weight (kg) 680
Breeding weight (kg) * 400
Post-calving weight (kg) ** 550
Service wither height (in) 50
Calving wither height (in) 56

* (0.6) mature body wt. (Troccon 1993)
** (0.82) mature body wt. (NRC 2001)

TARGET GROWTH RATES FOR HOLSTEIN HEIFERS

Months Live-weight gain(kg/d) Live-weight (kg)
Birth to 4 0.9 (0.8- 0-5wks) 150
5-10 0.65 280
11-13 0.8 350
14-17 0.9 460
18-22 0.9 595
23-calving 0.6 630*

*pre calving weight

“What does it cost to raise a heifer of good or bad genetic potential?”

Feed costs alone run $.95/day.
That amounts to $693.50 (365 days x *2 yrs. x $.95),
plus other costs to total an estimated $1,600.
*1996 data indicates average age for first calving in Ontario was 27 ½ months.

Andre Roy MSc.
Sally Charlton BSc. (Hons)
 April 2003

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