Short answer

Designers and researchers in animal husbandry should consider the initial physiological state (body weight) and adjust feeding regimens to achieve specific body composition outcomes, such as increased muscle or fat content.

Field: Human Factors
Source: Journal of the Indonesian Tropical Animal Agriculture (2009)
Method: Experimental research
Sample: 16 participants
Evidence: Strong effect

A ram's body composition, specifically its water, protein, and fat content, is significantly influenced by its initial body weight and the level of feed it receives. This human factors research insight is drawn from a 2009 study published in Journal of the Indonesian Tropical Animal Agriculture. Using Experimental research with 16 participants, researchers explored how this design variable affects real-world outcomes. The key design takeaway: Designers and researchers in animal husbandry should consider the initial physiological state (body weight) and adjust feeding regimens to achieve specific body composition outcomes, such as increased muscle or fat content.

Study

Human FactorsHigh ImpactStrong effect

Optimizing Livestock Growth: Body Weight and Feeding Levels Significantly Impact Body Composition

A ram's body composition, specifically its water, protein, and fat content, is significantly influenced by its initial body weight and the level of feed it receives.

Journal of the Indonesian Tropical Animal Agriculture · 2009

Key Findings

01Heavier body weight rams had significantly higher body water, protein, and fat content compared to lighter rams.
02Rams fed at 1.5x maintenance had higher body water and fat content than those fed at 1x maintenance.
03There was no interaction between body weight and feeding level on the change of body water, protein, and fat.

Application

Design takeaway

How to apply

When designing feeding programs or evaluating livestock for meat production, consider the initial weight of the animals and the caloric/nutritional density of their feed. Adjust feeding levels to target specific fat-to-lean ratios.

Project actions

01When studying biological systems, clearly define your independent variables (e.g., diet, initial size) and dependent variables (e.g., body composition metrics).
02Consider the environmental context (e.g., climate, breed) as it can influence results.

Method & Evidence

AimTo investigate how different initial body weights and feeding levels affect the body composition changes in indigenous rams.

MethodExperimental research

ProcedureSixteen rams were divided into two groups based on initial body weight (light and heavy). Each weight group was further divided into two subgroups receiving different feeding levels (1x maintenance and 1.5x maintenance). Live weight gain and body composition were measured.

Sample16 participants

ContextAnimal science, livestock production

Variables

IV["Body weight (light vs. heavy)","Feeding level (1x maintenance vs. 1.5x maintenance)"]

DV["Body water content","Body protein content","Body fat content","Live weight gain"]

CV["Breed of ram (indigenous)","Tropical environment","Experimental design (Split Plot)"]

Strengths & Limitations

Strengths

+Clear experimental design with two factors (body weight and feeding level).
+Quantitative measurement of key body composition parameters.

Limitations

The study used a small sample size (16 rams) and focused on a specific breed in a tropical climate, which limits generalizability.

Reliability & validity

The study's validity is supported by its controlled experimental design and quantitative measurements. Reliability could be enhanced by repeating the experiment with a larger sample size and across different environmental conditions.

Think critically

How might the 'change rate' of physical composition being similar across different initial weights, while absolute levels differ, inform long-term growth strategies for livestock?

Design Principles

"Physiological state and environmental inputs (nutrition) are primary determinants of biological composition and growth outcomes."

Understanding these relationships is crucial for livestock management, enabling the optimization of feeding strategies to achieve desired growth rates and meat quality. This research provides quantitative insights into how nutritional input and initial physiological state affect the physical makeup of animals, directly impacting yield and product characteristics.

What This Means for Your Design

Bigger sheep and sheep that eat more tend to have more fat and water in their bodies. How much you feed them matters more for fat and water than their starting size.

How to use in your project

1.This study can be referenced to support hypotheses about how environmental factors influence biological outcomes in a design project involving animal husbandry or bio-optimization.

Add to My Project

Quick Cite

Paragraph starter

Research by Setyawan et al. (2009) demonstrates that both initial body weight and feeding level significantly influence the body composition of rams. Specifically, heavier rams and those fed at a higher level (1.5x maintenance) exhibited greater body water, protein, and fat content. This suggests that nutritional management, in conjunction with an understanding of the animal's initial physiological state, is a key factor in optimizing meat quality and yield.

Source

Journal of the Indonesian Tropical Animal Agriculture

THE CHANGE OF BODY COMPOSITION OF INDIGENOUS RAMS ON DIFFERENT BODY WEIGHT AND FEEDING LEVEL

journal · 2009

View source

Questions About This Research

What does the research say about optimizing livestock growth: body weight and feeding levels significantly impact body composition?: Designers and researchers in animal husbandry should consider the initial physiological state (body weight) and adjust feeding regimens to achieve specific body composition outcomes, such as increased muscle or fat content. Evidence: Journal of the Indonesian Tropical Animal Agriculture (2009).
Why does "Optimizing Livestock Growth: Body Weight and Feeding Levels Significantly Impact Body Composition" matter for design?: Understanding these relationships is crucial for livestock management, enabling the optimization of feeding strategies to achieve desired growth rates and meat quality. This research provides quantitative insights into how nutritional input and initial physiological state affect the physical makeup of animals, directly impacting yield and product characteristics.
How can designers apply this research?: Designers and researchers in animal husbandry should consider the initial physiological state (body weight) and adjust feeding regimens to achieve specific body composition outcomes, such as increased muscle or fat content.
What were the main findings?: Heavier body weight rams had significantly higher body water, protein, and fat content compared to lighter rams.. Rams fed at 1.5x maintenance had higher body water and fat content than those fed at 1x maintenance.. There was no interaction between body weight and feeding level on the change of body water, protein, and fat.
What research method was used?: Experimental research with 16 participants.
How strong is the evidence?: Evidence strength is rated Strong effect, based on a 2009 journal from Journal of the Indonesian Tropical Animal Agriculture.
What should I do differently in my next project?: When designing feeding programs or evaluating livestock for meat production, consider the initial weight of the animals and the caloric/nutritional density of their feed. Adjust feeding levels to target specific fat-to-lean ratios.
What are the limitations?: The study focused on indigenous rams in a tropical environment, and results may vary with different breeds or climates. The 'change rate' of physical composition was similar, but the absolute levels differed.