Peihua ZHANG, Li LI, Xinyi LAN, Hao LING, Jintao QU, Qianming JIANG, Shengguo TANG

Isı Stresine Maruz Kalmış Süt Keçilerinde Rumen Korumalı Metiyonin İlavesinin Süt Performansı, Plazma Biyokimyasal İndeksleri ve Amino Asit Konsantrasyonu Üzerine Etkileri

Bu çalışmada, şiddetli ısı stresine (sıcaklık-nem indeksi >90) maruz kalan süt keçilerinde rumen korumalı metiyoninin (RPM) dört farklı konsantrasyonunun süt performansı üzerine etkisi incelendi. Aynı yavrulama zamanı ve laktasyon dönemine (120±10 gün) denk gelen 75 Guanzhong süt keçisi (52.6±4.9 kg), 15 hayvandan oluşan beş gruba ayrıldı ve her bir grup 0, 1.5, 3, 4.5 ve 6 g/gün konsantreli RPM içeren %13.55 ham protein diyeti ile beslendi. Deneme, dokuz günlük adaptasyon süresi ve 30 günlük örneklem ve analiz süresini içeriyordu. RPM ilavesi yem tüketimini değiştirmez iken, 1.5 g/gün konsantreli RPM ilavesi süt protein içeriğini, sütün besleme oranını ve ekonomik kazancı önemli ölçüde artırdı. Süt yağı ve üre-azot konsantrasyonlarında ve somatik hücre sayısında önemli bir değişiklik gözlenmedi. 1.5 g/gün konsantreli RPM uygulanan grupta plazma üre-azot seviyesi önemli ölçüde azaldı. RPM ilavesi, doza bağımlı bir şekilde plazma metiyonin ve toplam amino asit konsantrasyonunu arttırdı. RPM’nin en yüksek dozu (6 g/gün), plazma immünoglobulin G konsantrasyonunu artırdı. Nispeten düşük protein diyeti ile beslenen ve ısı stresine maruz kalan süt keçilerine uygun dozlu RPM ilavesinin, süt protein üretimini artırabileceği ve ekonomik kazancı iyileştirebileceği gösterilmiştir.

Eff ects of Supplementation with Rumen-Protected Methionine on Milk Performance, Plasma Biochemical Indices and Amino Acid Concentration in Dairy Goats Subject to Heat Stress

Th is study examined the eff ects of four levels of rumen-protected methionine (RPM) on the milk performance of dairy goats subjected to severe heat stress (temperature humidity index >90). Seventy-five Guanzhong dairy goats (52.6±4.9 kg) with the same farrowing period and lactation day (120±10 d) were randomly divided into five groups of 15 head and fed a 13.55% crude protein diet supplemented with 0, 1.5, 3, 4.5 or 6 g/d RPM in the concentrate. Th e trial included nine days adaptation time and 30 days of sampling and analysis. Th e addition of RPM did not change feed intake but 1.5 g/d RPM significantly increased milk protein content, the ratio of milk to feed, and the economic returns. No significant changes in milk fat or urea-nitrogen concentrations or somatic cell count were observed. Plasma ureanitrogen was significantly lowered in the 1.5 g/d RPM group. RPM supplementation increased plasma methionine concentration and total amino acid concentration in a dose-dependent manner. Th e highest dose of RPM (6 g/d) enhanced plasma immunoglobulin G concentration. It is demonstrated that supplementation with an appropriate dose of RPM to dairy goats fed a relatively low protein diet and subject to heat stress can increase milk protein production and improve economic returns.

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