Animal Growth and Development

Animal growth and development is a dynamic, multistage process integrating genetic programmes, endocrine signals and environmental inputs to transform a single fertilised cell into a fully formed, mature organism. During prenatal life, cell proliferation (hyperplasia) and tissue patterning (morphogenesis) create all organs and establish basic body plans. This is followed by organ maturation, in which cells enlarge (hypertrophy), acquire specialised functions and build the rudimentary systems required for independent survival. Postnatally, animals exhibit species-specific growth trajectories, often captured by a characteristic sigmoid (S-shaped) curve reflecting an initial lag phase, a period of rapid gain, and a plateau as skeletal maturity and adult size are attained. Key regulators include the hypothalamic–pituitary–growth-hormone axis, insulin-like growth factors, thyroid hormones and nutrient-sensitive pathways such as mTOR. Nutrition, temperature and social factors shape growth rate and body composition, while local tissue factors dictate differential growth of muscle, bone, fat and nervous tissue. Developmental processes remain plastic through defined windows—perinatal, juvenile and pubertal—during which stressors like undernutrition, hormonal disruption or environmental extremes can programme lifelong physiology and health. Understanding these coordinated events is central to fields as diverse as agriculture, conservation, biomedicine and regenerative biology.

Research from Nature Portfolio

Recent integrative studies have pinpointed gut-derived metabolites as direct modulators of bone growth and micro-architecture. In a cohort of peri- and postmenopausal women, elevated abundance of Bacteroides vulgatus was associated with lower bone mineral density, whereas higher circulating levels of the microbial fermentation product valeric acid correlated positively with bone mass. Valeric acid suppressed pro-inflammatory signalling in osteoclast precursors and promoted osteoblastic maturation in vitro, and, when administered to ovariectomised mice, prevented bone loss and preserved trabecular structure.
A complementary animal study has revealed a causal role for short-chain fatty acids—principally propionate and butyrate—in reprogramming osteoclast metabolism. These microbial metabolites triggered a shift towards glycolytic energy generation in osteoclasts, downregulating key differentiation factors and reducing bone resorption. Dietary supplementation with fermentable fibre restored bone mass in models of postmenopausal and inflammatory bone loss, underscoring the systemic reach of the gut–bone axis.

Animal Growth and Development publication trend

The graph below shows the total number of articles in animal growth and development across all publications each year (not limited to Nature Index journals).

Technical terms

Hyperplasia: Increase in cell number through mitotic division, driving early tissue expansion.

Hypertrophy: Enlargement of existing cells by accumulation of proteins and organelles, contributing to mass gain.

Compensatory growth: An accelerated growth phase that follows relief from growth-limiting conditions, allowing recovery of size deficits.

Hyperphagia: A transient increase in food intake beyond normal levels, often observed during refeeding after starvation.

Insulin-like growth factors (IGFs): Endocrine mediators of cellular proliferation and differentiation, central to anabolic growth processes.

Short-chain fatty acids (SCFAs): Microbial fermentation products (e.g., acetate, propionate, butyrate) that influence systemic inflammation, bone cell metabolism and gene expression.

References

1. Nutrition and Metabolism: Foundations for Animal Growth, Development, Reproduction, and Health.
2. Gut microbiota impacts bone via Bacteroides vulgatus-valeric acid-related pathways. Nature Communications (2023).
3. Short-chain fatty acids regulate systemic bone mass and protect from pathological bone loss. Nature Communications (2018).
4. Coding and Noncoding Genes Involved in Atrophy and Compensatory Muscle Growth in Nile Tilapia. Cells (2022).
5. Full compensatory growth before harvest and no impact on fish welfare in Atlantic salmon after an 8-week fasting period. Aquaculture (2022).