Journals / Ankara Üniversitesi Veteriner Fakültesi Dergisi / 2018 / Cilt: 65 - Sayı: 3

Estimation of live weights at the beginning and the end of grazing season in Tuj lambs via scores of factor analysis

Tuj kuzularında mera sezonu başlangıcı ve sezon sonu canlı ağırlıklarının faktör analizi skorları ile tahmin edilmesi

Pages
261–266
Publication Date
2022-10-12
DOI
—
🏛️Bibliographic metadata and full text access for this article are provided via DergiPark.
DergiPark Record ↗
✨

AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

In addition, it was concluded that applying factor analysis scores derived from independent variables decreased mistake in the model according to least squares method.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:This study was conducted in order to eliminate multicollinearity between body measurements of Tuj lambs and to estimate their live weights in the beginning and the end of grazing season (GS) using factor analysis scores, which were determined by calculating some body measurements, in multiple regression model.
📊
Key Findings & Data:For this purpose, the material of the study consisted of 297 Tuj lambs born between 2009 and 2013.
💡
Conclusion & Impact:In addition, it was concluded that applying factor analysis scores derived from independent variables decreased mistake in the model according to least squares method.
🔬Design:Modeling & Simulation
📍Scope:2009 Verileri
⚙️Variables:Domain Parameters

Abstract

This study was conducted in order to eliminate multicollinearity between body measurements of Tuj lambs and to estimate their live weights in the beginning and the end of grazing season (GS) using factor analysis scores, which were determined by calculating some body measurements, in multiple regression model. For this purpose, the material of the study consisted of 297 Tuj lambs born between 2009 and 2013. Live weights (LW) of lambs in the beginning and at the end of GS and body length (BL), withers height (WH), chest girth (CG), chest depth (CD), circumferences of cannon forelimb (CCF) and circumferences cannon hindlimb (CCH) measurements were analyzed in the study. Factor analysis were used to determine the estimated equation between the characteristics. It was determined that there was a multicollinearity between, CCF and CCH measured at the beginning of GS. Problem of multicollinearity between independent variables was eliminated by using factor scores (FS) determined by factor analysis in multiple regression models. Consequently, two factors were detected from results of factor analysis applied to body measurements to determine live weights of Tuj lambs in the beginning and at the end of GS. These factors for LW in the beginning and at the end of GS were found to explain 84.8% and 78.9% of total variance, respectively. Thereby, it was revealed that more accurate estimations could be made by using factor analysis scores in estimating live weights of Tuj lambs at the beginning and the end of GS. In addition, it was concluded that applying factor analysis scores derived from independent variables decreased mistake in the model according to least squares method.

Özet

Bu araştırma Tuj kuzularında vücut ölçüleri arasındaki çoklu bağlantıyı elimine etmek ve bazı vücut ölçülerinin hesaplanmasıyla belirlenen faktör analizi skorlarını, çoklu regresyon modelinde kullanarak, mera sezonu başı ve sezon sonu canlı ağırlıklarını tahmin etmek amacıyla yapılmıştır. Bu amaçla, araştırmanın materyalini 2009-2013 yılları arasında doğan 297 Tuj ırkı kuzu oluşturmuştur. Araştırmada kuzuların mera başı ve mera sonu döneminde alınan canlı ağırlıkları ile vücut uzunluğu, cidago yüksekliği, göğüs çevresi, göğüs derinliği, ön incik çevresi ve arka incik çevresi ölçülerinden yararlanılmıştır. Özellikler arasındaki tahmini denklemi belirlemek için faktör analizi skorlarından yararlanılmıştır. Mera sezonu başı döneminde ölçülen ön incik çevresi ve arka incik çevresi arasında çoklu bağlantının olduğu belirlenmiştir. Çoklu regresyon modelinde faktör analizi ile belirlenen faktör skorlarının kullanılması ile bağımsız değişkenler arasındaki çoklu bağlantı probleminin giderildiği tespit edilmiştir. Sonuç olarak Tuj kuzularında mera sezonu başı ve mera sezonu sonundaki canlı ağırlıklarını belirlemek için vücut ölçülerine uygulanan faktör analizi sonuçlarında iki faktör tespit edilmiştir. Sezon başı ve sonundaki bu faktörler, toplam varyansın sırasıyla %84.8'ini ve %78.9'unu belirlemiştir. Böylelikle Tuj kuzularının mera sezonu başı ve sezon sonu dönemindeki canlı ağırlıklarının tahmininde faktör analizi skorlarının uygulanmasının modeldeki yanılgıyı daha doğru olarak ortaya çıkarmıştır. Ayrıca bağımsız değişkenlerden üretilen faktör analizi skorlarının uygulanması sonucunda modeldeki yanılgıyı en küçük kareler yöntemine göre azalttığı kanaatine varılmıştır.

🔖

Cite This Article

ÖNK, K., GÜRCAN, İ. S., SARI, M. (2022). Estimation of live weights at the beginning and the end of grazing season in Tuj lambs via scores of factor analysis. Ankara Üniversitesi Veteriner Fakültesi Dergisi, Cilt: 65 - Sayı: 3, 261–266. https://ajindex.com/articles/444581

📄 Full Text PDF Viewer

📄

PDF görüntüleyici hazırlanıyor...

References (12)

  1. Yilmaz I, Eyduran E, Kaygisiz A, et al. (2011): Estimates of genetic parameters for lactation shape parameters with multivariate statistical technique in Brown Swiss cattle. Int J Agric Biol, 13, 174-178. 30. Ulusan HOK, Aksoy AR (1996) The performances of yield of Tushin and Morkaraman ewes at the farm of Veterinary Faculty University of Kafkas, Kars 2. Growth and body measurements. Kafkas Univ Vet Fak Derg, 2, 139-146.
  2. Topal M, Macit M (2004): Prediction of body weight from body measurements in Morkaraman sheep. J Appl Anim Res, 25, 97-100.
  3. Tinsley HEA, Brown SD (2000): Handbook of Applied Multivariate Statistics and Mathematical Modeling. Academic Press,
  4. New York. Tariq MM, Eyduran E. Bajwa MA, et al. (2012): Prediction of body weight from testicular and morphological characteristics in indigenous Mengali sheep of Pakistan: using factor analysis scores in multiple linear regression analysis. Int J Agric Biol, 14, 590-594. 26. Tabachnick BG, Fidell LS (2001): Using Multivariate Statistics. Allyn & Bacon, Inc, 4th Edition,
  5. New York. Sharma S (1996): Applied Multivariate Techniques. John Wiley & Sons, Inc, New York. Sari M, Onk K, Aksoy AR, et al. (2014): Determination of growth and some body measurements of Hemşin Lambs. Lalahan Hay Arast Enst Derg, 54, 15-20.
  6. Sari M, Isik S, Onk K, et al. (2013): Growth characteristics and some body measurements of Tuj Lambs. Erciyes Univ Vet Fak Derg, 10, 149-155.
  7. Sangun L, Cankaya S, Kayaalp GT, et al. (2009): Use of factor analysis scores in multiple regression model for estimation of body weight from some body measurements in Lizardfish. J Anim Vet Adv, 8, 47-50.
  8. Sakar E, Keskin S, Unver S (2011): Using of factor analysis scores in multiple linear regression model for prediction of kernel weight in Ankara walnuts. J Anim Plant Sci, 21, 182-185.
  9. Saatci M, Yildiz S, Kaya I (2003): New rearing systems for Tuj (Tushin) lambs. Small Rumin Res, 50, 23-27.
  10. Olatunji-Akioye AO, Adeyemo OK (2009). Live weight and chest girth correlation in commercial sheep and goat herds in Southwestern Nigeria. Int J Morphol, 27, 49-52.
  11. Mason IL (1996): A World Dictionary of Livestock Breeds, Types and Varieties. Fourth Edition. C.A.B International. 273 pp. Mahieu M, Naves M, Arquet R (2011): Predicting the body mass of goats from body measurements. Livestock Research for Rural Development, http://www.lrrd.org/lrrd23/9/mahi23192.htm. (20 January 2017).
  12. Kul S, Seker I (2000): The relationship between body weight and live body bone measurements