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Journals / Hayvan Bilimi ve Ürünleri Dergisi / 2026 / Cilt: 9 Sayı: 1

Relationships Between Transition Period Metabolic Profile, Reproductive Performance, and Metabolic Disorders in Dairy Cattle

Süt Sığırlarında Geçiş Dönemi Metabolik Profil ile Üreme Performansı ve Metabolik Rahatsızlıklar Arasındaki İlişkiler

Gülse Sivil(Ondokuz Mayıs Üniversitesi)0009-0009-1698-4802
Nuh Ocak(Ondokuz Mayıs Üniversitesi)0000-0001-7393-1373
Pages
69–91
Publication Date
2026-06-30
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AI Summary & Key Takeaways

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

The transition period, spanning the three weeks before calving and the three to four weeks after, is the most critical phase, as it determines milk yield, overall health status, and reproductive performance.

📌 3 Key Takeaways

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Objective & Hypothesis:The lactation cycle in dairy cows involves significant physiological, nutritional, metabolic, and immunological changes as it transitions from the final stage of pregnancy to the onset of high milk synthesis and secretion.
📊
Key Findings & Data:The transition period, spanning the three weeks before calving and the three to four weeks after, is the most critical phase, as it determines milk yield, overall health status, and reproductive performance.
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Conclusion & Impact:Based on the data obtained, it is concluded that an accurate analysis of homeorhetic adaptations and metabolic indicators during the transition period is essential for minimising economic losses in high-yield dairy operations.
🔬Design:Review & Systematic Survey
📍Scope:Comprehensive Sample
⚙️Variables:sığır · kuru dönem · erken laktasyon

Abstract

The lactation cycle in dairy cows involves significant physiological, nutritional, metabolic, and immunological changes as it transitions from the final stage of pregnancy to the onset of high milk synthesis and secretion. The transition period, spanning the three weeks before calving and the three to four weeks after, is the most critical phase, as it determines milk yield, overall health status, and reproductive performance. During this period, cows face a negative energy balance (NED) due to increased energy requirements and decreased dry matter intake. Metabolic disorders that develop during the transition are precursors to other secondary health issues. The imbalance between nutrient supply and demand in the first weeks of lactation necessitates comprehensive metabolic adaptation and regulation processes. Metabolic profile (parameter) tests, through metabolites such as free fatty acids, ß-hydroxybutyric acid, and glucose in blood, serum, or milk, enable monitoring of the animal's metabolic status. This review examines, in light of current literature, how deviations from reference values in metabolic indicators during the transition period affect reproductive parameters (e.g. the first postpartum estrus, estrus detection rate, first insemination, pregnancy rate at first insemination, and number of inseminations per pregnancy) and metabolic diseases (ketosis, milk fever, retained placenta, metritis, displaced abomasum, and lameness). Additionally, the importance of energy metabolism, pathological processes, their interactions with reproduction, and herd-monitoring strategies in field conditions is discussed. In conclusion, regular monitoring of metabolic profiles during the transition period is key to early detection of potential metabolic disorders, thereby safeguarding herd health and reproductive success. Based on the data obtained, it is concluded that an accurate analysis of homeorhetic adaptations and metabolic indicators during the transition period is essential for minimising economic losses in high-yield dairy operations.

Özet

Süt sığırlarında laktasyon döngüsü; gebeliğin son evresinden yüksek süt sentezi ve sekresyonunun başladığı sürece geçiş yaparken önemli fizyolojik, besinsel, metabolik ve immünolojik değişimlere sahne olmaktadır. Doğum öncesi 3 hafta ile doğum sonrası 3-4 haftalık süreci kapsayan geçiş dönemi süt verimi, genel sağlık durumu ve üreme performansının belirlendiği en kritik aşamadır. Bu süreçte inekler, artan enerji gereksinimi ve azalan kuru madde tüketimi nedeniyle negatif enerji dengesi (NED) ile karşı karşıya kalmaktadır. Geçiş döneminde şekillenen metabolik bozukluklar diğer sekonder sağlık sorunlarının öncülü niteliğindedir. Laktasyonun ilk haftalarında besin maddesi arzı ile talebi arasındaki dengesizlik, metabolizmanın kapsamlı bir adaptasyon ve regülasyon sürecine girmesini zorunlu kılmaktadır. Metabolik profil (parametre) testleri; kan, serum veya sütteki serbest yağ asitleri, β-hidroksibütirik asit ve glukoz gibi metabolitler aracılığıyla hayvanın metabolik durumunun izlenmesine olanak tanır. Bu derlemede, geçiş dönemi metabolik göstergelerinin referans değerlerden sapmasının üreme parametreleri (doğum sonrası ilk kızgınlık, kızgınlık belirleme oranı, ilk tohumlama, ilk tohumlamada gebelik oranı, gebelik başına tohumlama sayısı) ve metabolik hastalıklar (ketozis, süt humması, plasentanın atılamaması, metritis, abomasum yer değiştirmesi ve topallık) üzerindeki etkileri güncel literatür ışığında incelenmiştir. Ayrıca, enerji metabolizmasının önemi, patolojik süreçler ve üreme ile olan etkileşimleri ve saha koşullarında sürü izleme stratejileri ele alınmıştır. Sonuç olarak; geçiş döneminde metabolik profil testleri ile yapılan düzenli izlemeler, olası metabolik bozuklukların erken teşhis edilmesini sağlayarak sürü sağlığı ve üreme başarısının korunmasında kilit rol oynamaktadır. Elde edilen veriler ışığında, geçiş dönemindeki homeoretik adaptasyonların ve metabolik göstergelerin doğru analiz edilmesinin, yüksek verimli süt sığırı işletmelerinde ekonomik kayıpların minimize edilmesine temel teşkil ettiği sonucuna varılmıştır.

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Cite This Article

Sivil, G., Ocak, N. (2026). Relationships Between Transition Period Metabolic Profile, Reproductive Performance, and Metabolic Disorders in Dairy Cattle. Hayvan Bilimi ve Ürünleri Dergisi, Cilt: 9 Sayı: 1, 69–91. https://doi.org/10.51970/jasp.1932435

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