The Effect of Early and Late Weaning of Awassi Ewe on the Milk Characteristics
DOI:
https://doi.org/10.21070/jtfat.v7i01.1675Keywords:
sheep, Awassi, weaning, milk characteristicsAbstract
The objective of the present study was to assess the impact of early and late weaning on ewe performance, lamb postnatal growth, hormonal status and milk composition in Awassi ewes over a 30 days separation period at Animal Production Farm, College of Agriculture, Kirkuk University. Fifteen healthy, mature ewes were randomly assigned into two groups according to the weaning age: EWG (early weaning, }) at 60 days or LWG (late weaning, at 90 days. All the groups were kept in the same conditions of environment and nutrition. Body weights were determined for ewes and lambs at the start and end of the experiment, and blood and milk samples were obtained for hormonal and compositional analyses, respectively. The results of ANOVA showed that the short and the long weaning strategy had no effect on ewe body weight. Nevertheless, final weights of lambs in the EWG were significantly higher than in the LWG (P≤0.05), indicating better growth in early weaned lambs. Hormonal results Serum PRL levels were significantly raised in the EWG; serum E2, P, LH, and FSH levels did not significantly differ between groups. Milk composition analysis indicated that early weaning significantly increased milk fat, whereas protein, lactose, and solid non-fat of milk did not differ between groups. Results of correlation analysis showed high positive correlations between milk components, most notably between solid non-fat, protein, and lactose. These results indicated that early weaning improved lamb growth performance, increased milk fat with no detrimental effects on ewe health or reproductive hormone balance. The results reinforce the early weaning as a pragmatic alternative for enhancing efficiency in sheep production systems.
References
Abitante, G., Leme, P. R., de Paula Carlis, M. S., Ramírez-Zamudio, G. D., Gomes, B. I. P., de Andrade, L. B., Goulart, R. S., Pugliesi, G., Saran Netto, A., Dahlen, C. R., & Silva, S. L. (2024). Effects of early weaning on performance and carcass quality of Nellore young bulls. Animals, 14(5), 779.
Al-Barakeh, F., Khashroum, A. O., Tarawneh, R. A., Al-Lataifeh, F. A., Al-Yacoub, A. N., Dayoub, M., & Al-Najjar, K. (2024). Sustainable sheep and goat farming in arid regions of Jordan. Ruminants, 4(2), 241–255.
Ali, M. H., Ahmed, S. T., & Khalid, R. (2019). The impact of weaning age on growth performance in lambs. Journal of Animal Science Research, 45(3), 210–220.
Balthazar, C. F., Pimentel, T. C., Ferrão, L. L., Almada, C. N., Santillo, A., Albenzio, M., & Cruz, A. G. (2017). Sheep milk: Physicochemical characteristics and relevance for functional food development. Comprehensive Reviews in Food Science and Food Safety, 16(2), 247–262.
Bencini, R., & Pulina, G. (1997). The quality of sheep milk: A review. Australian Journal of Experimental Agriculture, 37(5), 485–491.
Bocquier, F., & Caja, G. (1999). Effects of nutrition on ewes’ milk quality. In Proceedings of the 5th Great Lakes Dairy Sheep Symposium.
Brown, T. A., Johnson, R. P., & Davis, L. (2019). The effect of weaning age on milk composition in dairy animals. Journal of Dairy Science, 102(5), 3421–3432.
Brown, T. J., Carter, M. L., & Robertson, K. L. (2022). Nutritional strategies for improving lamb growth post-weaning. Livestock Science, 150(4), 55–65.
Cannas, A., Pes, A., Mancuso, R., Vodret, B., & Nudda, A. (2008). Nutritional aspects of lactation in dairy sheep. Italian Journal of Animal Science, 7(1), 9–22.
Dhaoui, A., Mohamed, C., Moufida, A., Dbara, M., Seddik, M., & Hammadi, M. (2019). Factors affecting milk yield and composition over lactation of prolific D’man ewes. Tropical Animal Health and Production, 51, 1–12.
Dračková, M., Hadra, L., Janštová, B., Navrátilová, P., Přidalová, H., & Vorlová, L. (2008). Analysis of goat milk by near-infrared spectroscopy. Acta Veterinaria Brno, 77(3), 415–422.
Freitas de Melo, A., Orihuela, A., Hötzel, M. J., & Ungerfeld, R. (2022). What do we know and need to know about weaning in sheep? An overview of weaning practices, stress and welfare. Frontiers in Animal Science, 3, 1–17.
Galal, S., Gürsoy, O., & Shaat, I. (2008). Awassi sheep as a genetic resource and efforts for their genetic improvement: A review. Small Ruminant Research, 79, 99–108.
García, M. R., López, D. J., & Hernández, A. (2018). Milk fat variability with different weaning strategies. Animal Production Research, 45(3), 256–267.
Haenlein, G. F. W. (2004). Goat milk in human nutrition. Small Ruminant Research, 51(2), 155–163.
Hassan, S., & Mohammed, A. (2019). Study of the relationship between some blood parameters and growth traits of Awassi lambs. Kirkuk University Journal for Agricultural Sciences, 10(1), 14–20. https://doi.org/10.58928/ku19.10103
Hermiz, H. N., Shaker, A. S., Al-Khatib, T. R., Ameen, S. M., Ahmed, A. M., & Hamad, D. A. (2016). Inheritance of wattle and their effect on twining and some productive traits in Shami goat. International Journal of Advances in Science Engineering and Technology.
Jones, P. R., & White, K. E. (2020). Nutritional and genetic influences on milk composition. Veterinary Nutrition Journal, 12(4), 178–190.
Jones, R. D., Nelson, W. P., & Carter, S. H. (2020). Growth performance and metabolic adaptation in early-weaned lambs. Small Ruminant Research, 98(2), 75–82.
Kailasapathy, K. (2015). Chemical composition, physical, and functional properties of milk and milk ingredients. In Dairy processing and quality assurance (pp. 77–105).
Kenyon, P., Thompson, A., & Morris, S. (2013). Breeding ewe lambs successfully to improve lifetime performance. Small Ruminant Research, 118.
Khan, Z., Ahmed, H., & Malik, S. (2022). Milk protein stability in response to management practices. International Journal of Dairy Science, 18(2), 67–79.
Kocsis, R., Süle, J., Nagy, P., Gál, J., Tardy, E., Császár, G., & Rácz, B. (2022). Annual and seasonal trends in cow’s milk quality determined by FT-MIR spectroscopy. Acta Veterinaria Hungarica, 70(3), 207–214.
Liu, T., Li, F., Wang, W., Wang, X., Ma, Z., Li, C., Weng, X., & Zheng, C. (2022). Early feeding strategies in lambs affect rumen development and growth performance. Frontiers in Veterinary Science, 9, 925649.
Martinez, A. J., Gonzalez, P. M., & Lee, D. M. (2017). Early weaning effects on lamb growth and metabolic response. Veterinary Animal Nutrition, 12(1), 32–41.
Mayer, H. K., & Fiechter, G. (2012). Physical and chemical characteristics of sheep and goat milk in Austria. International Dairy Journal, 24(2), 57–63.
McCoard, S. A., Cristobal-Carballo, O., Knol, F. W., Heiser, A., Khan, M. A., Hennes, N., Johnstone, P., Lewis, S., & Stevens, D. R. (2020). Impact of early weaning on small intestine, metabolic, immune and endocrine system development, growth and body composition in artificially reared lambs. Journal of Animal Science, 98(1), skz356.
McNeilly, A. S., Jonassen, J. A., & Fraser, H. M. (2019). Hormonal control of lactation and fertility. Reproductive Biology, 6(2), 87–98.
McSweeney, P. L. H., & Fox, P. F. (2017). Advanced dairy chemistry (4th ed.). Springer.
Mohammed, A. K., Hassan, S. F., & Al-Salihi, Z. A. K. I. (2021). Effect of some non-genetic factors on lamb’s growth traits of Awassi sheep. Annals of the Romanian Society for Cell Biology, 8148–8151. http://annalsofrscb.ro/index.php/journal/article/view/2354
Mhamad, H. J., Palani, Z. M. R., & Al-Zubaidy, A. (2025). Investigation of the chemical compounds, antioxidant effect and therapeutic properties of Crocus sativus L.: A review. Indonesian Journal of Innovation and Applied Sciences, 5(1), 89–98. https://doi.org/10.47540/ijias.v5i1.1829
Neville, M. C., Morton, J., & Umemura, S. (2020). Lactation and prolactin regulation: Mechanisms and implications. Journal of Endocrinology, 244(1), R1–R10.
Oftedal, O. T. (2012). The evolution of milk secretion and its ancient origins. Animal, 6(3), 355–368.
Palani, Z. M. R., Al-Obaidy, M. H. A., Hameed, K., & Sirwan, K. (2020). Effect of selenium and zinc supplements on carcass characteristics and glutathione activity in male Kurdi lambs. Plant Archives, 20, 231–234.
Palani, Z. M. R. K., Al-Jaf, H. I., & Raheem, S. M. (2019). Effect of selenium addition to Kurdi sheep and its interactions with essential and toxic elements. Plant Archives, 19(2), 3963–3970.
Palani, Z. M. R., & Omer, E. S. (2025). Analysis of estrogen, testosterone, and cholesterol interactions in Kurdi sheep and goats. Passer Journal of Basic and Applied Sciences, 7(2), 1141–1145. https://doi.org/10.24271/psr.2025.531060.2209
Park, Y. W. (1994). Nutrient and mineral composition of commercial US goat milk yogurts. Small Ruminant Research, 13(1), 63–70.
Park, Y. W., Juárez, M., Ramos, M., & Haenlein, G. F. W. (2007). Physico-chemical characteristics of goat and sheep milk. Small Ruminant Research, 68(1–2), 88–113.
Pulina, G., Nudda, A., Battacone, G., & Cannas, A. (2018). Dairy sheep nutrition: Feed, feeding and management. Small Ruminant Research, 166, 1–11.
Raynal-Ljutovac, K., Lagriffoul, G., Paccard, P., Guillet, I., & Chilliard, Y. (2008). Composition of goat and sheep milk products: An update. Small Ruminant Research, 79(1), 57–72.
Salihi, A., & Alsaadi, S. (2024). Reproductive efficiency of local ewes treated with Spirulina algae powder with or without folic acid during early pregnancy in summer. Kirkuk University Journal for Agricultural Sciences, 15(2), 97–102. https://doi.org/10.58928/ku24.15215
Sanz Sampelayo, M. R., Chilliard, Y., Schmidely, P. H., & Boza, J. (2007). Influence of type of diet on the fat constituents of goat and sheep milk. Small Ruminant Research, 68(1–2), 42–63.
Selvaggi, M., D’Alessandro, A. G., & Dario, C. (2017). Environmental and genetic factors affecting milk yield and quality in three Italian sheep breeds. Journal of Dairy Research, 84(1), 27–31.
Sinkiewicz-Darol, E., Bernatowicz-Łojko, U., Łubiech, K., Adamczyk, I., Twarużek, M., Baranowska, B., Skowron, K., & Spatz, D. L. (2021). Tandem breastfeeding: A descriptive analysis of the nutritional value of milk when feeding a younger and older child. Nutrients, 13(1), 277.
Smith, J. W., Taylor, B. L., & Carter, H. D. (2021). Weaning practices and their impact on dairy performance. Animal Science Review, 55(6), 391–405.
Smith, L. T., & Johnson, K. W. (2021). Effects of early and late weaning on ewe body condition and reproductive performance. Journal of Agricultural Sciences, 56(2), 112–119.
Smith, R. D., & Grove, K. L. (2018). The impact of weaning on endocrine function in mammals. Journal of Animal Physiology, 112(4), 355–372.
Sultan, K., & Alhamdani, M. (2020). Effect of ewe weight and weaning age on productive performance of lambs and milk yield and components of Awassi ewes. 47, 181–193.
Walker, W. H. (2021). Endocrine regulation of reproductive hormones in mammals. Hormones and Behavior, 133, 104687.
Yousif, A. N., Abdullah, S. M., Shaker, A. S., Ameen, Q. A., Mohammed, M. S., Muhammad, S. J., Mustafa, S. M., & Aziz, C. R. (2023). Genetic diversity assessment of some Iraqi sheep breeds using microsatellite DNA markers. Tikrit Journal for Agricultural Sciences, 23(3), 41–50. https://doi.org/10.25130/tjas.23.3.5
Yousit, A. N., Abdullah, S. M., Shaker, A. S., Ameen, Q. A., Mohammed, M. S., & Abdalla, M. R. (2024). Fecundity Booroola gene (FecB) polymorphism in some indigenous sheep breeds in Iraq. Egyptian Journal of Veterinary Sciences, 1–7.
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Copyright (c) 2026 Mohammed M. ZinAlabidin, Husham Jaafar Musa Albayati, Shahla F. Hassan, Aya A. Nadhim, Ahmed S. Shaker
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